All of the Following Are Forms of Child Sexual Abuse

All of the following are forms of child sexual abuse, EXCEPT

A) intimate kissing between an adult and a child under the age of consent.
B) an adult masturbating while a child under the age of consent watches.
C) an adult fondling the genitals of a child who gives willing consent.
D) masturbation or fondling of the genitals between children of similar ages.