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

C. the cultural tradition of using stones to crack nuts has arisen in only some populations

Explanation:

The cultural tradition of using stones to crack nuts has arisen in only some populations of the Chimpanzees who live in environments containing oil palm nuts, meaning not all Chimpanzees actually use stone to crack down the nut except few of them and this because their environment contain oil palm nuts.

c. the cultural tradition of using stones to crack nuts has arisen in only some populations.

Explanation:

According to the passage above we are made to understand that many chimpanzees live in environments containing oil palm nuts but some members of only a few populations use stones to crack open the nuts this shows that the few population that use stones to crack open nuts learnt to use it because of the environment which they found themselves, also learning by association.