Regular aerobic exercise decreases the fat-to-muscle ratio because?

Question

A. excess fat stores become more toned and conditioned.
B. excess fat stores are burned for energy.
C. increases in muscle mass push excess fat into the bloodstream.
D. increased oxygen demands signal the body to become anaerobic for greater muscle mass.
i think that its b but i don't know

Answer 1

The answer is obviously B.
Well, A is wrong because fats never become toned. Duh!
C and D are plain gibberish.

Answer 2

out of those choices Bis the most correct answer