What Did the Experiments on Social Isolation Among Rhesus Monkeys

What did the experiments on social isolation among rhesus monkeys show?

A) Monkeys isolated for long periods of time were highly aggressive when returned to others of their kind.
B) Artificial mothers provided sufficient contact for young monkeys to develop normally.
C) The behaviour of rhesus monkey infants is totally dissimilar to that of human infants.
D) Adult physical affection is vital for normal development.
E) Monkeys do not require social experience to develop normally.