Which of the Following Is NOT True About Masturbation

Which of the following is NOT true about masturbation?

A) Most researchers have found that approximately 90 percent of men and 60 percent of women have masturbated at some time.
B) Masturbation is engaged in throughout one's life.
C) Masturbation can result in physical illness or sexual dysfunction.
D) Experts agree that the only danger of masturbation is the psychological harm resulting from guilt, shame, or embarrassment one associates with it.