Which skill could help maintain body position while also assisting in navigation?

Finning is the correct option because it refers to the movement of the legs in a way that promotes efficient propulsion through the water while helping to maintain a swimmer's body position. When a person uses a finning motion, they can effectively move through the water while keeping their body streamlined, which is crucial for both navigation and conserving energy. This skill enhances their ability to travel efficiently and maintain a good position in the water, whether they are swimming or guiding someone else.

Other skills, such as breath control, are important for overall swimming but do not directly contribute to maintaining body position or assisting in navigation. Catching waves is typically associated with surf conditions and contributes more to excitement than it does to controlled movement through water. Cannonballing, on the other hand, is more of a playful action that causes splashing and does not offer any assistance in navigation or body position maintenance.