Mr Brown Has Gathered Evidence That the Self-Esteem of Students

Mr. Brown has gathered evidence that the self-esteem of students is negatively correlated with their typical levels of anxiety. Before he uses this evidence to conclude that self-esteem reduces anxiety,Mr. Brown should first be reminded that

A) events often seem more probable in hindsight.
B) random sequences of events often don't look random.
C) we often exaggerate the extent to which others share our opinions.
D) correlation does not prove causation.