You Observe Two Populations of Chimpanzees Using Sticks to Dig

You observe two populations of chimpanzees using sticks to dig termites out from nests for food. One population uses long sticks; the second population uses short sticks. Which of the following observations would NOT support the hypothesis that the choice of stick length is a learned behavior?

A) There are equal numbers of short and long sticks in the environment of each population.
B) The population using long sticks has mostly long sticks in its environment.
C) The chimpanzees using short sticks have obtained them by breaking long sticks.
D) Young chimpanzees in both populations start out using sticks of many different sizes.
E) Individuals that don't use the common stick length for that population catch fewer termites.