Behaviors of Entertainers Like the Stars of the Movie Jackass

Behaviors of entertainers like the stars of the movie Jackass, in which individuals are shown taking reckless risks of their own devising, can be bizarre and outrageous without being viewed as evidence of a mental disorder because such behaviors

A) are voluntary and serve a useful function.
B) are rare and unusual.
C) can cause harm.
D) deviate from society's standards of proper behavior.