Current Thinking Is That Institutionalized Infants Often Appear Forlorn and Apathetic

Current thinking is that institutionalized infants often appear forlorn and apathetic because they

A) are usually undernourished, and hence, are less alert than children raised at home
B) have been reinforced by caretakers for being undemanding
C) have acquired a sense of helplessness, for their attempts to control the environment have been unsuccessful
D) have learned to attract attention by acting disinterested in their caretakers