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Must Be True. The correct answer choice is (C)
The hypothesis itself has two steps: (1) parasitic connections "would otherwise clog up our memories" and (2) dreaming is how your brain gets rid of parasitic connections. So, if you do not dream, you do not get rid of parasitic connections, and those connections clog up our memories.
Pay close attention to the question stem here: it asks what is most strongly supported by the hypothesis, not the entire stimulus. The correct answer choice, then, will depend directly on the hypothesis.
Answer choice (A) does not follow from the hypothesis, because we are concerned with time spent dreaming, not sleeping – it is possible that small animals spend less time sleeping, but more of that time dreaming. Or, maybe they do not get many parasitic connections that need to be cleared out.
Answer choice (B) assumes that dreaming clears away nearly all parasitic connections. But, the hypothesis only assumes that some are cleared away.
Answer Choice (C), the correct answer, addresses this directly: mammals that are prevented from dreaming have clogged up memories. Students often reply with "But, what about the spiny anteater – it does not dream at all." However, the answer choice is limited to mammals "that would normally dream" – it specifically excludes the anteater.
Answer choice (D) is tricky: it is likely to be correct, but does not necessarily follow from the hypothesis. Remember what the question stem is looking for.
Answer choice (E), like (D), might be correct, but does not necessarily follow from the hypothesis. In addition, it goes a little too far: we think the only mammal that does not dream is the spiny anteater. But, the stimulus says nothing about lizards or other non-mammals.