Metabolism is the process of conversion of food into energy. The condition or situation that increases a person's metabolic rate is fever i.e., option D.
What is metabolism?
Metabolism is the chemical reaction leading to the release of energy from food.
Fever is a way of fighting between the immune system and the invading pathogen. It raises body temperature.
This increases metabolism which results in more burning of calories.
Thus, the correct option is D.
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