Sexually active unmarried teens are more likely to use contraceptives if they

A) underestimate their peers' sexual activity.
B) do not want to appear to be sexually promiscuous.
C) are in an exclusive sexual relationship involving open communication.
D) have been extensively exposed to TV shows in which unmarried people are having sex.

Being in an exclusive sexual relationship involving open communication promotes a safer and more responsible approach to sexual activity, which means that sexually active unmarried teens are more likely to use contraceptives. Option A is not a significant factor that directly affects contraceptive use. Option B focuses on the perception of others and not on responsible sexual behavior, which does not necessarily result in contraceptive use. Option D, extensive exposure to TV shows in which unmarried people are having sex, may have an impact, but it is not as significant as being in a responsible relationship with open communication.