Although Many Chimpanzees Live in Environments with Oil Palm Nuts

Multiple Choice

Although many chimpanzees live in environments with oil palm nuts, members of only a few populations use stones to crack open the nuts. The likely explanation is that ________.

A) the behavioral difference is caused by genetic differences between populations
B) members of different populations have different nutritional requirements
C) the cultural tradition of using stones to crack nuts has arisen in only some populations
D) members of different populations differ in learning ability