Jaccard and His Colleagues Set Out to Determine Whether Close

Jaccard and his colleagues set out to determine whether close friends influence adolescents' sexual behavior. What were their results?

A) Close friendships have no impact on the likelihood of engaging in sexual activity.
B) Adolescents were more likely to be sexually active when their best friends were.
C) Adolescents were likely to delay becoming sexually active if their best friends were already sexually active.
D) Adolescents were more likely to be sexually active if their parents knew about their friends' sexual activity.