The Electrons That Are Present in NADH and FADH₂ Are

Multiple Choice

The electrons that are present in NADH and FADH₂ are very high energy and theoretically sufficient to produce ATP alone. Why then have biological systems evolved a way that uses the various steps of cellular respiration to produce ATP?

A) because steps in respiration allow for a controlled release of energy in small increments
B) because all living organisms must use oxygen and therefore must carry out cellular respiration
C) because it would be less efficient to produce ATP directly from NADH and FADH₂
D) because the amount of ADP is insufficient to phosphorylate and make ATP