Chimpanzees Raised in the Wild Watched a Human Model Using

Chimpanzees raised in the wild watched a human model using a tool either efficiently or inefficiently and then themselves interacted with the tool. Which statement is true?

A) Only the chimpanzees observing efficient behavior used the tool, but use was not efficient.
B) Only the chimpanzees observing efficient behavior used the tool, and use was efficient.
C) Both groups used the tool in the manner that they observed.
D) Both groups used the tool but did not differ in their efficiency.