Determine Which, If Any, of the Three Statements Are Equivalent

Determine which, if any, of the three statements are equivalent.
-I. If it is sunny and the pool is open, then I will go swimming.
II. If I do not go swimming, then it it is not the case that it is sunny or the pool is open.
III. It is sunny and the pool is open, or I will go swimming.

A) II and III are equivalent
B) I and III are equivalent
C) I, II and III are equivalent
D) None are equivalent