The Need for Mutual Attachments Meant Survival for Our Ancestors

The need for mutual attachments meant survival for our ancestors. This need

A) is at the core of our existence and thus is characteristic of people everywhere.
B) is largely a 20th century motive that is most evident in industrialized societies.
C) is a learned motive serving our more fundamental need for self-esteem.
D) conflicts with our more basic need to survive.