Women Conform More and Men Conform Less When They Believe

Women conform more and men conform less when they believe they are being observed.According to Eagly (1987) ,why does this occur?

A) because being watched makes people self-aware,which brings out their underlying personalities
B) because women are easier to manipulate,whereas men tend to be more independent
C) because women and men tend to be knowledgeable about different kinds of topics
D) because people feel greater pressure in public to behave in ways consistent with their gender-role