The author implies that control to any extent over the "frailties" that constrain our behavior. is thought to presuppose ______.
A.a thorough grasp of the principle that cultural detail in human behavior. can differ arbitrarily from society to society
B.that those frailties are recognized as currently beneficial and adaptive
C.that there is little or no overlay of cultural detail that masks their true nature
D.a full understanding of why those frailties evolved and of how they function now
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