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 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
d) a belief that a statement is true just because the person has heard it repeated over and over again