One Criticism of Kohler's Suggestion That Chimps Demonstrate Insight Learning

One criticism of Kohler's suggestion that chimps demonstrate insight learning is:

A) that the chimps were not exposed enough to the problem of getting the banana
B) Kohler did not explain how chimps solved problems, but merely described it
C) that the schedule of reinforcement was not identified
D) that chimps are prepared to climb and jump and do so in the wild