In Money and Ehrhardt's biosocial Theory of Gender-Typing Event in Gender-Role

In Money and Ehrhardt's biosocial theory of gender-typing event in gender-role development is _____ , an event which ensures that _____.

A) the inheritance of an X or a Y chromosome from the father; the fetus will develop ovaries (with an X chromosome) or testes (with a Y chromosome)
B) the inheritance of an X or a Y chromosome from the mother; the fetus will develop ovaries (with an X chromosome) or testes (with a Y chromosome)
C) the development of testes or ovaries; the fetus will develop a penis and scrotum (if testes have formed) or a clitoris and labia (if ovaries have formed)
D) the development of male or female external genitalia; males will be raised as males and females will be raised as females