The correct answer is C. Our perspiration evaporates rapidly.
When we sweat, the water on our skin evaporates, which takes heat away from our body and makes us feel cooler. A fan helps to evaporate sweat by blowing air over our skin. This increases the rate of evaporation and makes us feel even cooler.
Option A is incorrect because a fan does not supply cool air. The air that comes out of a fan is the same temperature as the air around it. However, a fan can make us feel cooler by blowing air over our skin and helping to evaporate sweat.
Option B is incorrect because a fan does not cool the air. The air that comes out of a fan is the same temperature as the air around it. However, a fan can make us feel cooler by blowing air over our skin and helping to evaporate sweat.
Option D is incorrect because the conductivity of air does not increase when a fan is turned on.