Everything you do has an affect on you, whether it be positive or negative
Its too expensive or they feel they don't need it because they don't get sick or hurt or don't go to the doctor
You didn't provide a graph? Generally, when we're talking about homeostatis, we're talking about the neutral state of the body during which it can function optimally. If you've provided a graph which involves the human body under an intense workload, then we can be sure that during this period the body isn't under homeostasis.
The answer is: [C]: "Calorie" .
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Note: The "capital "C"; which means "food calorie".
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