You Have Just Completed a Study of Chimpanzee Tool Use

You have just completed a study of chimpanzee tool use. You noticed that young chimpanzees accompanied females to sites where tools and termites were available, and females practiced termite fishing. Young chimpanzees usually played and socialized with each other while females fed. If these chimpanzees grow up to termite fish themselves, you can conclude that this behavior was passed on through which mechanism?

A) active teaching
B) observational learning
C) social facilitation
D) imitation