Figure 43.1 -How Would You,as an Athlete or Trainer,interpret the Data Portrayed

Figure 43.1
-How would you,as an athlete or trainer,interpret the data portrayed in the graph above?

A) A high-carbohydrate diet is deleterious to all individuals because carbohydrates contain empty calories.
B) A high-carbohydrate diet consumed before an endurance event improves endurance.
C) The protein-fat diet resulted in the longest endurance.
D) It is highly probable that muscle cells involved in exercise use fatty acids as a fuel source.