Archer Can't Find His Room Key, and He Has to Get

Multiple Choice

Archer can't find his room key, and he has to get his textbook for his next class. He's locked himself out of his room before, and, in the past, the Resident Assistant on duty would let him in. This time, however, the RA is not in her room. Instead of calling security or the dorm office, Archer continues to spend time trying to find the RA. Archer is limited by his:

A) algorithm.
B) mental set.
C) divergent thinking.
D) heuristic.