Logical ReasoningDifficulty: Easy

PT21 S3 Q18 Explanation

Prolonged exposure to nonionizing

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

TopicsMost Supported

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Stimulus

Prolonged exposure to nonionizing radiation—electromagnetic radiation at or below the frequency of visible light—increases a person’s chances of developing soft-tissue cancer. Electric power lines as well as such electrical appliances terminals are sources of nonionizing radiation.

What this question is testing

Most Supported

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence 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
18.

Which one of the following conclusions is best supported by the

Answer choices

  1. Too Strong5% picked this

    People with short-term exposure to nonionizing radiation are not at risk of developing

    Too Strong: not at risk Opposite Logic We were informed that long term exposure to NR, higher risk of ST cancer This is making the overly extreme and opposite-logic move of saying, not long term exposure to NR, no risk of ST cancer There might be many things that increase our risk of soft-tissue cancer besides nonionizing radiation. So even if people are avoiding this risk factor, that doesn't mean they have zero risk. A nonsmoker doesn't have zero risk of lung cancer (maybe they live near a factory that billows our noxious smoke / maybe there are genetic forms of lung cancer).

  2. Out of Scope: other cancers1% picked this

    Soft-tissue cancers are more common than

    We have no information about how rare or common soft-tissue cancer is vs. how rare or common other cancers are.

  3. Out of Scope: frequently cured cancer2% picked this

    Soft-tissue cancers are frequently cured spontaneously when sources of nonionizing radiation are removed from

    We have zero information about anyone ever being cured of cancer, let alone this frequently happening in a spontaneous way.

  4. Correct87% picked this

    Certain electrical devices can pose health risks for

    Why this is right

    This is just reinforcing our Inference: prolonged exposure to electric power lines, electric blankets, or video-display terminals increases our chance of developing soft-tissue cancer. Electrical blankets and video-display terminals are "certain electrical devices". Having an increased chance of developing cancer is "a health risk". To support this answer choice, we just need to know of at least one electrical device that comes with a health risk, and we know of at least two.

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

  5. Opposite Logic One-Claim Support5% picked this

    Devices producing electromagnetic radiation at frequencies higher than that of visible light do not increase a person’s risk

    If we're told in an Inference paragraph that, tall men love their mothers can we infer then that small men don't love their mothers Of course not. It's probably the case that almost all men, regardless of height, love their mothers. This kind of trap answer occurs frequently in Reading Comp, Necessary Assumption, and Inference. If we read "Black lives matter", then the test will try to bait us into picking an answer that accuses that sentence of saying "non-black lives don't matter". We should also feel wary any time we're considering an answer on Must Be True / Most Supported that is supported by only one claim. This answer choice would be derived (incorrectly) from just the first sentence. But 99% of correct answers on MBT / MS are being derived by combining 2 or more claims together.

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