Respuesta :
Answer:
B. the electron transport chain
Explanation:
Electron transport chain is the final step of aerobic cellular respiration that produces a large number of ATPs by using the energy of proton motive force as generated during oxidation of NADH and FADH2.
Sprint needs a high amount of energy and muscles of athletes are conditioned to carry out aerobic cellular respiration during sprints to avoid any lactic acid accumulation due to fermentation.