How might fin shape differ in a fish with a torpedo-shaped cylindrical body and a fish with a flattened body?

Fish with torpedo shaped bodies would have fins built for speed, fish with flattened body’s probably use their fins more for stability, so they would probably be sticking up on top of their bodies and sides and not as arrow dinamic as a torpedo shaped fish, who would have fins that and pointed back for speed.

The correct answer is  b)