Attachment Has Received Much Research Attention Over the Decades for All

Attachment has received much research attention over the decades for all of the following reasons except

A) it is a child's first relationship, which may serve as the basis for future relationships with others.
B) attachment is easy t study because it is not influenced by more basic biological factors.
C) attachment between infants and their mothers greatly increases the chances that children will survive.
D) quality of attachment in infancy is related to behavioral, social, emotional, and cognitive adjustment later in life.