Final answer:Fans help cool the body through convection, replacing the warm air near the skin with cooler air from the environment which makes the exercise experience more comfortable. The correct option is (d).Explanation:When exercisers use fans or are exposed to wind while exercising, they experience a cooling effect through the mechanism of convection.Convection involves the movement of a fluid, in this case, air, which carries away the warm air that naturally accumulates around the body, replacing it with cooler air from the surrounding environment. This increase in air flow enhances the rate at which heat is removed from the surface of their skin, contributing to a feeling of coolness.Fans are particularly efficient in aiding comfort in warm weather because they facilitate this process by moving air continuously, thus maximizing the convective heat transfer.Using a fan feels refreshing in the summer because it enhances convection, the heat transfer process delivering a continuous flow of cooler air to replace the warm air around the body, making the air 'feel' cooler despite the actual temperature remaining the same....

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