Figure 7.2 -What Happens at the End of the Chain in Figure

Multiple Choice

Figure 7.2
-What happens at the end of the chain in Figure 7.2?

A) Two electrons combine with a proton and a molecule of NAD⁺.
B) Two electrons combine with a molecule of oxygen and two hydrogen atoms.
C) Four electrons combine with a molecule of oxygen and four protons.
D) Four electrons combine with four hydrogen and two oxygen atoms.
E) One electron combines with a molecule of oxygen and a hydrogen atom.