Harlow Studied the Role of Surrogate Mothers in Comforting the Infant

Harlow studied the role of surrogate mothers in comforting the infant monkey during times of danger or stress. He found that __________.

A) neither the wire mother nor the cloth mother was effective in comforting the infant during times of stress
B) the cloth mother, but not the wire mother, was effective in comforting the infant during times of stress
C) both the wire mother and the cloth mother comforted the infant during times of stress, but the cloth mother was more effective
D) only the mother that had furnished nourishment to the infant, whether wire or cloth, was effective in comforting the infant during times of stress