In a famous series of experiments conducted by Harry Harlow, infant monkeys were separated from their mothers at birth. The infants were then given two surrogate mothers (a terry-cloth "mother" and a wire "mother"), each of which alternately had a nursing bottle that provided food to the infants. The experimental results showed that in frightening situations the infant monkeys:
a. were more likely to become aggressive toward the wire mother than toward the terry-cloth mother
b. failed to seek out either of the mothers because of their lack of experience in seeking contact comfort
c. preferred the wire mother, even when the terry-cloth mother had the nursing bottle
d. preferred the terry-cloth mother, even when the wire mother had the nursing bottle
e. would run and cling to whichever mother had the nursing bottle