Which of the Following Is True for Exercise When Fat

Which of the following is true for exercise when fat is the energy source?

A) During rest, most of the energy needs of the body are met by the supply of plasma FFA to the cells.
B) Hormones, such as epinephrine, are secreted during exercise, activate HSL, and these stimulate the release of FFA into the blood.
C) During high-intensity exercise, 75 percent of the total energy cost is derived from carbohydrates,
While the other 25 percent or less is derived from fat.
D) All of the answers are correct.