A. Hand washing only (just a guess )
The blood vessels dilate to increase the "blood traffic" through the lungs to carry more oxygen to the muscle. The lungs work harder (faster respiratory rate) to increase the rate of oxygen/carbon dioxide exchange in the lungs.
The question is asking: which statement is always TRUE about the frequency at which you eat meals? Generally, you should eat fewer, but smaller meals, because that way you give your body the chance to digest them properly. Therefore, the best answer among the options is: B. Eating more, smaller, low-calorie meals is better than eating fewer, large, high-calorie meals.
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