Holly is an endurance runner who trains 4 to 5 days per week and typically competes in three marathons a year. She is also a vegan. What percentage of her total daily calories should come from...

Holly is an endurance runner who trains 4 to 5 days per week and typically competes in three marathons a year. She is also a vegan. What percentage of her total daily calories should come from carbohydrates?

A. 40% to 50%

B. 50% to 60%

C. 60% to 70%

D. 70% to 80%