According to the Textbook,which of the Following Statements About Group

According to the textbook,which of the following statements about group living is correct?

A) Group living gave our human ancestors protection from predators, efficiency in acquiring food, and help with child rearing.
B) All mammalian species live in groups.
C) Humans have a physical need, but not a psychological need, to belong in groups.
D) Any collection of people in a specific geological space can be considered a group.