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

Determine which, if any, of the three statements are equivalent.
-I. The raft flipped if and only if the guide misjudged the rapid or the crew fell overboard.
II. The crew fell overboard, or if the guide misjudged the rapid then the raft flipped.
III. If the guide misjudged the rapid, then the raft flipped or the crew fell overboard.

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