Final answer:
The defense mechanism that may best explain Fred's behavior is denial. Denial is a defense mechanism in which individuals refuse to accept or acknowledge a reality or truth that is too difficult to face.
Step-by-step explanation:
The defense mechanism that may best explain Fred's behavior is denial. Denial is a defense mechanism in which individuals refuse to accept or acknowledge a reality or truth that is too difficult to face. In Fred's case, he may be denying or refusing to accept something that is causing him anxiety or discomfort. For example, if Fred is failing a class, he may deny or refuse to accept that reality and instead convince himself that he is doing well.