Mark is angry when the teacher blames him for misbehaving when it actually was the child behind him who had been acting up. As he leaves after school, he shoves another boy who gets in his way. Freud would say
That Mark is unconsciously using the defense mechanism of:

A) displacement.
B) repression.
C) projection.
D) denial.

Displacement

In psychology, a defense mechanism where an individual shifts negative feelings or behaviors from the original source to a more acceptable or less threatening target.

Repression

A defense mechanism where unpleasant thoughts, memories, or desires are unconsciously excluded from conscious thought.

Projection

A defense mechanism in which an individual attributes their own unacceptable thoughts, feelings, and motives to another person.