Studies of Personality in Monozygotic and Dizygotic Twins Indicate That

Studies of personality in monozygotic and dizygotic twins indicate that

A) monozygotic twins are more similar than dizygotic twins.
B) monozygotic and dizygotic twins show equivalent levels of similarity.
C) there is no clear connection between genes and personality.
D) if one monozygotic twin is high in a trait, the other will generally be low in the same trait.