Research Conducted with Nurturing and Non-Nurturing Mother Rats Has Found

Research conducted with nurturing and non-nurturing mother rats has found that when a mother rat does not nurture and respond to her babies

A) a specific gene was "turned off" and the babies became more fearful and stressed by future environmental events.
B) a specific gene was "turned on" and the babies become more assertive in pursuing their mothers to get her attention.
C) the babies try to find another mother rat who will care for them.
D) we can give the mother rat hormones that will make her more responsive to her offspring.