To Reduce One Molecule of O₂,________ Electron(s)must Be Passed Through

Multiple Choice

To reduce one molecule of O₂,________ electron(s) must be passed through the electron transport chain and ________ molecule(s) of NADH is(are) oxidized.

A) 4;2
B) 2;1
C) 1;1
D) 1;2
E) 4;4