Q: Fact 1: Oxygen is just one substance transported by the blood. Fact 2: Active brains and muscles require more oxygen and nutrients. Given the two facts above, muscles require substances transported in the body by?

Choose from: (A). sugar. (B). food. (C). fibers. (D). fat. (E). neurons. (F). blood. (G). glucose. (H). bones.
The answer is:
(F).