Cory had been working on a calculus problem for several hours when the best strategy for solving the problem suddenly came to him. It was as if the correct solution path made sense all at once.
This BEST illustrates what psychologists call . Select one:

A. working backward to solve a problem
B. insight
C. mental set
D. means-end analysis

B. Insight

Explanation: Also known as epiphany, an "aha" moment or a "eureka' feeling, insight occurs when a solution to a difficult problem presents itself suddenly, quickly and without warning, usually after several incorrect attempts based on trial and error. As a new way to interpreting problems that immediately yields solutions, insight allows one to be able to see or understand something clearly. Cory therefore has exhibited insight according to psychologists.

answer; ethnocentric;

answer; depression and breathing related sleep disorder(independent);