Although Sex Is an Important Part of People's Lives, for Many

Although sex is an important part of people's lives, for many years, discussion of sexual topics was taboo. In the recent history of psychology, who first made sex an appropriate sexual topic for discussion?

A) Alfred Kinsey, when he published his research findings about human sexual practices
B) William Masters and Virginia Johnson, when they published their findings on the human sexual response
C) Sigmund Freud, when he made the libido an important part of his psychoanalytic theory
D) Helen Singer Kaplan, when she wrote about desire and sexual readiness