According to Money and Ehrhardt's Biosocial Theory of Gender-Role Development

According to Money and Ehrhardt's biosocial theory of gender-role development, how is one's gender role determined?

A) Biological forces and social influences interact.
B) Biological forces are the key determinant for males, and social influences are the key determinant for females.
C) Biological influences are the primary force, but social influences have a minor role.
D) Social influences are the primary force, but biological influences have a minor role.