Why Does NADH Yield 3 ATP While FADH₂ Only Yields

Multiple Choice

Why does NADH yield 3 ATP while FADH₂ only yields 2 ATP?

A) NADH has a higher electrochemical potential than FADH₂
B) NADH enters the ETC at complex I while FADH₂ enters it at complex II
C) The standard free energy difference between NADH and NAD⁺ exceeds the standard free
energy difference between FADH₂ and FAD
D) The chemical energy stored in NADH is more than that stored in FADH₂
E) All of the above