Running for a long period of time, such as during a marathon, can result in muscle fatigue. Which process is important to a runner at the end of a marathon? A. lactic acid fermentation to produce ATP without oxygen
B. Alchoholic fermentation to release carbon dioxide
C. The Krebs cycle to produce NADH and FADH2
D. The electron transport chain to produce ATP

I believe the answer would be D

Explanation:

I believe it would be D because at the end of the marathon people are extremely exhausted and tired and I believe that the electron transport chain is  needed in order to produce energy at the end. It would not be A because during the end of the race people need oxygen to be able to finish the race. Maybe when the race starts than it could be A. B just is not accurate. During the end of the race runners do not need to produce NADH so I think the answer is D. I hope that this helps.

answer; i believe the correct answer to the above question is ( friction)

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