Which of the Following Statements Supports the Biological Theory of Morality

Which of the following statements supports the biological theory of morality?

A) Newborns cry when they hear another baby cry.
B) Researchers have recently discovered the "moral gene."
C) Infants are skilled at regulating emotion, which leads to internalization of moral rules.
D) Reciprocal exchanges are far more common, varied, and highly developed in primates than in humans.