Man feels discomfort due to humidity. Which of the following is the appropriate reason for this?

Man feels discomfort due to humidity primarily because sweat does not evaporate efficiently in high humidity conditions. Evaporation of sweat from the skin surface is a critical mechanism for cooling the body. In high humidity, the air is already saturated with moisture, significantly slowing down the rate of sweat evaporation. As a result, the body retains more heat, leading to overheating and discomfort. This lack of effective cooling makes the body feel hotter and more uncomfortable compared to dry conditions, where sweat evaporates more readily and provides a cooling effect. Therefore, the correct answer is [C] Sweat not evaporating due to humidity. Understanding this phenomenon is essential for managing heat stress and designing cooling strategies in hot, humid environments, impacting areas such as workplace safety, athletic performance, and general well-being.