Logical ReasoningDifficulty: Easy

PT16 S2 Q3 Explanation

Although water in deep aquifers

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

TopicsMust be True

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Stimulus

Although water in deep aquifers does not contain disease‐causing bacteria, when public water supplies are drawn from deep aquifers, chlorine is often added to the water as a disinfectant because contamination can occur as a result of flaws in pipes or storage tanks. Of 50 municipalities that all pumped water from the not chlorinate had less bacterial contamination than the water supplied by the municipalities that added chlorine.

What this question is testing

Must be True

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
3.

Which one of the following can properly be concluded from the information

Answer choices

  1. Trap13% picked this

    A municipality’s initial decision whether or not to use chlorine is based on the amount of bacterial contamination

  2. Trap0% picked this

    Water in deep aquifers does not contain any bacteria of

  3. Trap1% picked this

    Where accessible, deep aquifers are the best choice as a source for a

  4. Correct82% picked this

    The regional government’s standards allow some bacteria in municipal

    Why this is right

    Answer D is correct.

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

  5. Trap4% picked this

    Chlorine is the least effective disinfecting

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