After spending two hours trying to solve an engineering problem,Amira finally gave up. As she was trying to fall asleep that night,a solution to the problem popped into her head. Amira's experience best illustrates

A) the belief perseverance phenomenon.
B) the availability heuristic.
C) insight.
D) a mental set.

Belief Perseverance

Clinging to one's initial conceptions after the basis on which they were formed has been discredited.

Availability Heuristic

Estimating the likelihood of events based on their availability in memory; if instances come readily to mind (perhaps because of their vividness), we presume such events are common.

Mental Set

A tendency to approach a problem in one particular way, often a way that has been successful in the past.