Which of the following is NOT mentioned in the passage as the reason for babies' cry

A．Children with truthful cry may eventually draw their mothers' attention.
B．Noisy infants are preferred by their mothers for their health and strength.
C．Mothers would rather nurse the obedient babies.
D．Mothers tend to ignore the deceitful cry.

A．Scientists discovered why animal infants cry.
B．The difference in the mount of children's cry is somewhat due to genes.
C．Babies have a violent reaction to the mother's ignorance.
D．Chimpanzees' annoyance can hardly be alleviated.