Which of the Following Is the Correct Definition of Cognitive

Which of the following is the correct definition of cognitive dissonance?

A) a state of tension that occurs when a person's behavior does not correspond to the his or her attitude
B) the tendency for members of a group to avoid taking responsibility for their actions because they assume that others will do so
C) the tendency for members of a close-knit group to think alike for the sake of harmony and to suppress disagreement
D) a belief that a statement is true just because the person has heard it repeated over and over again
E) the tendency of individual group members to put in less effort when they think others will "pick up the slack."