Logical ReasoningDifficulty: Easy

PT10 S4 Q6 Explanation

In the past century

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

TopicsPrinciple-Conform

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Stimulus

In the past century, North America has shifted its main energy source first from wood to coal, then from coal to oil and natural gas. With each transition, the newly dominant fuel has had less carbon and more hydrogen than its predecessor had. It the main energy source will be pure hydrogen.

What this question is testing

Principle-Conform

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
6.

Which one of the following expresses a general principle that could underlie

Answer choices

  1. Trap2% picked this

    If a series of transitions from one state of a system to another state of that system is allowed to continue without interference, the

  2. Trap2% picked this

    If each of two desirable attributes belongs to a useful substance, then the most useful form of that substance will have those

  3. Trap1% picked this

    If the second stage of a process has been completed more quickly than the first stage, the third stage of that process will be

  4. Correct91% picked this

    If each step in a series of changes involves a decrease of one attribute of the thing undergoing the change and an increase of

    Why this is right

    Answer D is correct.

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

  5. Trap3% picked this

    If one substance is better for a certain purpose than another substance is, then the best substance for that purpose is one that includes

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