When Luz Began Studying the Variation of Sexual Activities Around

When Luz began studying the variation of sexual activities around the world, she was surprised to find that ____.

A) unmarried people living together have more sex than married people living together or single people living alone
B) twenty-five percent of adults worldwide have never had sex
C) ten percent of people in the United States claim to have sex every day
D) homosexuality was banned in ancient Greece