Which Statement Concerning Sexual Activity and Adulthood Is True

Which statement concerning sexual activity and adulthood is true?

A) There has been a significant increase in incidence of sexually transmitted diseases in middle-aged Americans.
B) Middle-aged women are more likely than middle-aged men to use frequency of intercourse as the key indicator of sexual satisfaction.
C) Men ages 75-85 are less likely to be sexually active than their female age peers.
D) The book HIV Wisdom for Older Woman was designed to educate grandmothers in how to talk to grandchildren about sexually transmitted diseases.