Early humans, as hunter-gatherers, did not know when they would find food. If they found fat, they ate it, because fat could be stored in the body and used later when food might be scarce. For this reason, humans evolved to like fat. Human cravings have not changed much, even though our environments have. So our preference for fatty foods can be attributed to
A. collective efficacy.
B. softwiring.
C. differential selection.
D. adaptation.
Answer: D
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