The correct answer is C. Sweating is important to control the temperature of the body. When the body gets too hot, it sweats to cool itself down. The sweat evaporates, taking heat away from the body. This is why you feel cooler when you sweat.
Option A is incorrect because sweating does not improve normal health. In fact, sweating can lead to dehydration if you do not drink enough fluids.
Option B is incorrect because sweating does not open the pores of the skin. The pores of the skin are always open, even when you are not sweating.
Option D is incorrect because sweating does not excrete the smell of the body. The smell of the body is caused by bacteria that live on the skin. When you sweat, these bacteria multiply and produce a smelly substance.
I hope this helps! Let me know if you have any other questions.