Until Recently, What Aspect of Teenage Sexuality Did Social Scientists

Until recently, what aspect of teenage sexuality did social scientists focus on?

A) Until the late 1990s, it was taboo to study teenage sex.
B) Just like identity, autonomy, and intimacy, researchers have always studied the normative aspects of adolescent sexuality.
C) Until fairly recently, researchers only focused on the problematic aspects of adolescent sexuality (precocious sex, promiscuous sex, unsafe sex, etc.) .
D) Until fairly recently, most researchers were preoccupied with understanding adolescent sexuality and, as a result, important topics, such as promiscuous sex and unsafe sex, were neglected.