Logical ReasoningDifficulty: Medium

PT145 S2 Q14 Explanation

Activist: Medical conditions such as

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsFlaw

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Stimulus

Activist: Medical conditions such as cancer and birth defects have been linked to pollutants in water. Organic pollutants such as dioxins, and inorganic pollutants such as mercury, are ingested by fish and move up the food chain to people, where they accumulate in tissue. Since most cancers and birth defects are incurable, pollutants, given that such industries are unlikely to comply adequately with strict environmental regulations.

What this question is testing

Flaw

Your task

Describe the reasoning error the argument actually commits.

Common trap

Answers that name a real logical flaw the argument doesn't actually make.

Winning move

Articulate the gap in the reasoning yourself, then match it to the choice that describes that gap.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
14.

A flaw in the activist’s reasoning is

Answer choices

  1. Correct74% picked this

    fails to consider the possibility that a significant number of occurrences of cancer and birth defects may be caused by preventable

    Why this is right

    Whenever a flaw answer choice begins fails to consider / overlooks the possibility we can ask ourselves, "Does this sound like an objection to the argument"? In this case, yes! We can use this idea to argue the Anti-Conclusion, "Yo, author -- halting industries that produce pollutants that lead to cancer / defects is not the only effective way to reduce the incidence of cancer / defects. There are other effective ways. After all, a significant number of cancer / defects are caused by preventable factors other than industrial pollutants."

    Skill tested: Flaw · how this choice captures the argument's function is the move to repeat next time.

  2. Not an Objection0% picked this

    does not consider the possibility that pollutants can cause harm to nonhuman species as well

    Whenever a flaw answer choice begins fails to consider / overlooks the possibility we can ask ourselves, "Does this sound like an objection to the argument"? In this case, no. Saying that "pollutants can also harm nonhuman species" isn't objecting to either conclusion. If anything, it's underscoring the author's idea that we should halt industries that produce these pollutants.

  3. Opposite12% picked this

    takes for granted that certain effects can be produced independently by

    Whenever a flaw answer choice begins takes for granted / presumes / fails to establish we can ask ourselves, "Did the author need to assume this?" Does the author need to assume that "certain effects can be produced independently by several different causes"? What certain effects are we talking about? Cancer and birth defects? Was the author thinking that there are several independent causes of cancer and birth defects? No, she was only thinking about one specific cause --- pollutants in water. If anything, the idea that "certain effects (cancer and birth defects) can be produced independently by several difference causes" sounds more like the Objection we pointed out in (A). By showing that cancer and birth defects come from more than one place, you weaken the author's conclusion that "the only effective way to reduce cancer and birth defects is to stop pollutants".

  4. Too Weak13% picked this

    fails to consider whether industries may voluntarily decrease their output

    We can again ask ourselves, "would this be an objection to the argument?" To a certain extent, ye — "Hey, author, just because industries are unlikely to comply with strict regulations doesn't mean we have to halt these industries. After all, they may voluntarily decrease their output of pollutants." Some may say, did the author really fail to consider this? If the author is saying that industries wouldn't even be likely to sufficiently comply with strict environmental regulations (were we to make laws against pollutants), then hasn't she implicitly considered and rejected the idea that industries would do this voluntarily? It violates common sense (or is too exotic of a possibility) to argue that, "I won't comply with your law, but I will consider doing it voluntarily". These are industries, not 6 year old kids who will only make their bed if their parents aren't nagging them to do it. Or, we could say, the author did fail to consider this, and then just compare the objection we get from this answer to the one we get from (A). (A)'s is stronger because if there are other significant sources of cancer / birth defects that are preventable, then halting industry isn't the only way to significantly reduce their incidence. (D) is just saying, "Maybe the industries will just volunteer to do it?" It's less compelling and weaker impact as an objection.

  5. Not an Objection0% picked this

    fails to consider the possibility that chemicals now classified as pollutants have some beneficial effects

    Would it be an objection to the argument if we said, "Yo author — what if these pollutants have some beneficial effects we just haven't discovered yet?" No, first of all, that is another real longshot of an objection. But it also doesn't even address the author's concern. Whatever benefits these pollutants may have, they are nonetheless linked to these cancers and birth defects, so the author can still cogently argue that stopping these pollutants would lower the incidence of cancer / birth defects. If it also deprives us of the potential benefits of these pollutants, so be it. The author has only claimed that it will reduce the incidence of cancer and birth defects, not that it would have no negative tradeoffs.

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