Henry is a new father. He enjoys spending time with his new son, feeding him, playing with him, and even changing his diapers. Henry's behavior not match the expectations of sociobiologists. Which of the following would explain why?

a. The behavior of humans often fails to conform to the stereotyped images of sexually promiscuous males and coy females.
b. Evolutionary psychologists have tended to rely on data from case studies, which can be a poor guide to participants' actual sexual behaviors.
c. Modern humans are not affected by evolutionary pressures.
d. In most societies, it is no longer evolutionarily beneficial for males to have as many offspring as they can.

Answer: a