As a bicyclist pedals up a hill to the finish line of a race and "feels the burn" in his leg muscles, those muscle cells are most likely utilizing
A) only oxygen for maximum ATP production.
B) some lactate fermentation and lactic starting to build up in his muscle tissue causing a cramp.
C) only cellular respiration for maximum ATP production.
D) both cellular respiration and oxygen for maximum ATP production.
B
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