For the Following Argument, Choose the The Best Candidate for an Implicit

For the following argument, choose the the best candidate for an implicit premise given the premises and conclusion provided. Your aim is to make the argument valid or forceful:
P1) If I go out with him, then it will be a cold day in hell P2) _ C1) I won't go out with him

A) It is hot in hell today
B) I will go out with him
C) It is a cold day in hell
D) If it is a cold day in hell, then I will go out with him