In a Classic Study, Harry Harlow (1958) Raised Baby Monkeys

In a classic study, Harry Harlow (1958) raised baby monkeys in cages with one "mother" figure made of wire, and another covered with warm, fuzzy cloth. For half of the monkeys, the wire mother held a bottle of food; for the other half, the cloth-covered monkey held the food. Researchers observed where the monkeys spent most of their time. Which of the following best summarizes the implications of the study results?

A) Babies' bonds with their parents are primarily based on the need for food.
B) Babies need comforting physical contact to thrive, as well as food and clean, safe surroundings.
C) Babies tend to engage in physical play with their fathers, and receive comfort from their mothers.
D) Babies can thrive when bottle-fed, just as well as when nursed at the mother's breast.