Which Differences Exist Among Different Cultures with Respect to the Timing

Which differences exist among different cultures with respect to the timing of teenage sexual activities?

A) In developing nations,sexually experienced females,ages 15-19,are married; in developed nations,sexually experienced teens of the same age are not married.
B) In developing nations,sexually experienced males and females,ages 15-19,are likely to be married.
C) There is very little difference in the timing of sexual behaviors among developed nations such as the United States,Sweden,and Australia.
D) In most Asian countries,first intercourse occurs somewhat earlier than in the United States.