Kip Is a Professional Auto Mechanic Whose Hobby Is Restoring

Multiple Choice

Kip is a professional auto mechanic whose hobby is restoring old cars. He picked up a classic Thunderbird convertible at an auction, but after spending several weekends tinkering with the engine, he still couldn't figure out what was wrong with it. As he was waking up one morning, he suddenly realized what the problem was. Kip's sudden realization of the problem's solution is an example of:

A) mental set.
B) a heuristic.
C) insight.
D) functional fixedness.