Which Statement Best Describes Patterns of Teens and Oral Sex

Which statement best describes patterns of teens and oral sex? 

A)  Teens with more conservative attitudes are more likely to engage in oral sex. 
B)  Teens from lower socioeconomic classes are more likely than those from higher socioeconomic classes to engage in oral sex. 
C)  The majority of heterosexual teens engage in oral sex after they have already engaged in sexual intercourse. 
D)  Equal numbers of males and females engage in both giving and receiving oral sex.