PT60, S1, Q17 - Humankind would not have survived

[jennifer]

Can someone please explain how to tackle this problem, step by step...thank you.


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[ManhattanPrepLSAT1]

The most important claim to line up is the conclusion. Notice how weak the conclusion in the stimulus is - our ancestors were at least partially altruistic.

Now look at the conclusions of each answer choice.

(A) says some students manage their time well.
(B) says that plants that consume insects are incapable of photosynthesis.
(C) says that if fragile ecosystems are not protected by government action, their endemic species will perish.
(D) says that the resources used to create that power will become depleted.
(E) says that either public buildings are expensive or to construct or they do not harmonize with their surroundings.

The weakness in the conclusion is best mimicked in answer choice (A). Also, answer choice (A) follows the linking pattern found in the stimulus.

One cannot do x, without also doing y. Y has some characteristic z. Therefore, to do x one must be able to do z.

If you need any of the incorrect answers explained more extensively, please let me know!