Which of the Following "Common Sense" Findings Is Indeed True

Which of the following "common sense" findings is indeed true ?

A) Most of us expect beautiful people to be unintelligent.
B) Playing violent video games is a safe way to release aggressive tendencies.
C) People come to like an activity more when they are given a large reward for engaging in it.
D) People tend to overestimate the extent to which others agree with their points of view.