Biologically speaking, metabolism is the sum of all chemical processes within the body, though it is often referred to as those which involve digestion and cellular respiration.
That said, the answer here should be B: <span>The process by which the body gets energy from food.
For the record, A is the definition of puberty, C is likely the definition of hormones, and D is the definition of adolescence.
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It's the same reasoning as why insurance gives better deals to people of greater age.. They are seen to have more experience and be more "mature " to drive safer if you have more years driving your insurance goes down.. same concept
Vitamins and minerals help the body use and break down carbohydrates, proteins and fats
