(CORRECT ANSWER ONLY)

Four students were sent to the vice principal’s office for cutting class. After suspending the first three, the vice principal faced Gwen Takahashi, an "A student" who never got in trouble. When the vice principal saw who the fourth student was, he immediately said, “This must be a mistake. You never do anything wrong. Go back to class.” This is an example of

A. the self-serving bias.
B. the halo effect.
C. the fundamental attribution error.
D. assumed-similarity bias.