Answer:
D. were socially isolated, unable to communicate with other monkeys, and incapable of caring for their young.
Step-by-step explanation:
Attachment theory is an emotional bond that connect one person to another. Monkeys reared in Isolated Monkey have not been connected with other monkeys rared and have not experience how to get attached or care for the young. It has not been registered in their mind to act the way other do hence a difference between the Isolated and the reared once.
They will be socially distance from others also.