Bob lives in the northwest region of the united states. he retired at age 62 after 30 years of work in a management position for an aerospace company. he and his wife of 40 years carefully saved money so that they could be very active in their retirement. they now spend their winters as “snowbirds,” traveling in their mobile home to the “sun belt.” now at age 69, they have spent 7 years in the same community in arizona where they are well-known and have made many friends. in the summer, they usually take one extended trip to the mountains. they enjoy good health and believe that keeping active is the key to their zest for life. what theory best describes this scenario?

as university of miami psychologists debra lieberman and adam smith pointed out in a recent article in the journal current directions in psychological science, humans have social and psychological mechanisms to deter incest. with very few exceptions, marriages between brothers and sisters and between parents and their children are verboten in every human culture. the primary psychological anti-incest mechanism is the yuck response. even the idea of sex with their mom or dad, bro or sis is upsetting to most people. the psychologist jonathan haidt has found that nearly everyone is repelled by the prospect of brother-sister sex, even in hypothetical situations in which there is no chance of pregnancy).

the biological cost of incest

this raises an interesting question: just what’s so bad about incest? sure, having sex with your dad or your sister seems gross — but why? some anthropologists have argued that incest taboos are learned social conventions. this explanation, however, doesn’t make sense to me as it does not explain the widespread existence of anti-incest mechanisms in creatures ranging from cockroaches to chimpanzees. second, the incest taboo is about as close to a universal law as human moral rules get.

why should mechanisms to avoid incest be so widespread both in nature and across human societies? the answer is simple. the problem with having sex close with relatives is that there is an astonishingly high chance that your offspring will be born with a serious birth defect.

answer:   c.

it was not against the chinese government.

explanation: