Which of the Following Statements Is True Concerning Macronutrient Catabolism

Which of the following statements is true concerning macronutrient catabolism during physical activity?

A) The liver markedly increases its release of protein for use by active muscle as activity progresses from low to high intensity.
B) Muscle glycogen serves as the predominant carbohydrate energy source during the early stages of physical activity and as intensity increases.
C) Compared with carbohydrates and protein catabolism, lipid remains the preferential fuel during intense aerobic activity because it rapidly supplies ATP during oxidative processes.
D) In anaerobic efforts, proteins are the only contributor to ATP formation.