Olympic athletes have lower resting heart rates because        A. their lungs tend to be naturally larger.   B. they exercise regularly, which improves the efficiency of their heart.   C. they have a lot of muscle mass due to weightlifting.   D. they tend to eat low-fat diets.

THIS USER ASKED 👇

Olympic athletes have lower resting heart rates because
    
  A. their lungs tend to be naturally larger.
  B. they exercise regularly, which improves the efficiency of their heart.
  C. they have a lot of muscle mass due to weightlifting.
  D. they tend to eat low-fat diets.

THIS IS THE BEST ANSWER 👇

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