25) Although their relationship has generally been very happy, when Jennifer gets angry at Gary, the handful of insensitive or unkind things that Gary has done to her over the years flood into her mind, biasing her to believe that Gary is no good for her. Jennifer’s conclusion may be based on

reaction formation

Explanation:

Reaction formation: In psychology, the term "reaction formation" is referred to as one of the different psychological defense mechanisms whereby an individual tends to go beyond denial and often behaves in an opposite manner to what she actually feels or thinks. The conscious behaviors are being adopted to "overcompensate" the anxiety of an individual associated with the "socially unacceptable" unconscious emotions or thoughts.

In the question above, the given statement represents reaction formation.