After Struggling and Struggling to Find the Solution to a Calculus

Multiple Choice

After struggling and struggling to find the solution to a calculus problem,you decide to hang it up for the night.You close your books and move on to some other activity.The next day,you open your book to try once again.Much to your amazement,the answer seems suddenly obvious and you solve the problem within a few minutes.You just demonstrated:

A) vicarious learning.
B) latent learning.
C) insight learning.
D) the ability to use a cognitive map.