Which of the Following BEST Supports Bowlby's Belief That Attachment

Which of the following BEST supports Bowlby's belief that attachment is a highly evolved system of regulation?

A) Baby monkeys showed a distinct preference for cloth-covered substitute mothers over wire substitute mothers.
B) Monkeys that developed attachment relationships with cloth-covered substitute mothers found comfort in the substitute but did not form normal relationships with other monkeys later in life.
C) Harlow concluded from his studies that "these results attest to the importance-possibly overwhelming importance-of bodily contact and the immediate comfort it supplies in forming the infant's attachment for its mother."
D) Monkeys demonstrated attachment to their cloth-covered mother after separations of up to a year.