Rewrite the Statement in the Form "If P, Then Q

Multiple Choice

Rewrite the statement in the form "if p, then q".
-I will be happy only if he calls.

A) If I am happy, then he must have called.
B) If I am happy, then he won't call.
C) If I am not happy, then he will call.
D) If he calls, then I will be happy.