PrepTest 128, Section 3, Question 3

Parallel ReasoningDifficulty1 of 5
The questionFull text in your LawHub copy of PrepTest 128

If Patricia eats a heavy, spicy meal tonight,(39 more words not shown)

Which one of the following(12 more words not shown)

Reading the argument

The meal guarantees heartburn; it doesn't have to be the only way Patricia could get heartburn. Maybe she gets it on other nights too. All we need here is the guarantee we're given: if she eats this heavy, spicy meal, heartburn follows.

Then the second statement carries us one step further. If she has that heartburn, she'll be grouchy tomorrow morning. Put the two guarantees together: the meal brings heartburn, and the heartburn brings grouchiness. So the meal guarantees grouchiness. The conclusion follows.

What we’re looking for

For the parallel question, keep the three positions straight: first event, middle event, final event. The premises connect the first to the middle and the middle to the final; the conclusion connects the first directly to the final. We want another argument that makes those same moves.

Working the answers

  • A

    The first two statements fit: planting only daffodils leads to squirrels eating the bulbs, and squirrels eating the bulbs leads to no flowers blooming. Here, “only” describes which flowers Ruth plants; planting that selection is the starting condition.

    But the conclusion starts with the final result, no flowers, and works backward to daffodils. Other things could have prevented flowers from blooming. To match Patricia, A would need to conclude that if Ruth plants only daffodils, no flowers will bloom.

  • B

    Starting in early spring leads to being able to plant tomatoes early, which leads to having plenty for canning. Those first two links match the meal, heartburn, and grouchiness. But B then says the final result is absent and draws a conclusion about which earlier action did not occur. Patricia's argument never starts from a missing result; it concludes what will happen if the first condition occurs.

  • C

    Maria has two possible starting choices, petunias or geraniums, each leading to its own color. The conclusion preserves those alternatives: purple or red flowers. We don't have one chain in which the first event produces a middle event that produces a final one.

  • D
    Correct

    Planting old rose varieties takes the meal's place. A beautiful garden takes heartburn's place. Impressed neighbors take grouchiness's place. The first premise connects roses to beauty, and the second connects beauty to impressed neighbors. The conclusion connects roses directly to impressed neighbors, just as the original connects the meal directly to grouchiness.

  • E

    Producing well requires one of two actions, pruning or fertilizing. Bryan wants that result and missed the pruning opportunity, so the argument predicts he will fertilize. That is a choice between alternative actions, not a chain of two guarantees. Wanting the result also doesn't guarantee that Bryan will take the needed action; he might forget the fertilizer too.

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