Answer:
To provide energy
Explanation:
Carbohydrates are the body's number one choice of fuel because they can be converted to glucose, which in turn is needed to make ATP (our energy).
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D) Activity level because the more activity you do, the higher your metabolism which means you lose calories faster which means eventually your consumption of energy a day will increase. Unless you do a lack of exercise in which case you would have a lower consumption of energy without gaining weight when eating.