The Role of the Oxygen Molecules Required for Aerobic Respiration

The role of the oxygen molecules required for aerobic respiration is:

A) to accept the low energy electrons at the end of the electron transport chain.
B) to form ATP.
C) to produce CO₂.
D) to store high energy electrons to pass to complex I of the electron transport chain.
E) to accept electrons directly from either NADH or FADH₂.