Ecologists claim that group behavior can aid the survival of a band of gorillas.
Which three statements are evidence that group behavior can aid the survival of a band of gorillas?

A. A larger group intimidates predators.

B. The group spreads out to hunt for food.

C. Young gorillas learn survival skills from the group.

D. The gorilla group members compete for food and water.

E. Individual gorillas are always allowed to leave the group.