What type of vessel is solely propelled by sails?

The correct answer identifies a vessel that relies exclusively on sails for propulsion. Sailboats, often referred to as sailing vessels, harness wind power to move through the water. This method of propulsion has been used for centuries and is distinguished by the presence of sails rigged on masts, which catch the wind to drive the boat forward.

For the other options, while propeller-driven vessels utilize engines that turn propellers to move, and commercial fishing vessels are often equipped with engines for efficiency, neither matches the definition of being solely propelled by sails. Moreover, vessels defined by manual propulsion, such as canoes or kayaks, may use paddles and not sails at all. The specific definition and characteristics of a sailing vessel make it clear why this choice is the correct one.