Choose the Correct Path Taken by a Pair of Electrons

Choose the correct path taken by a pair of electrons as they travel down the electron-transport chain.

A) NADH → Complex I → CoQ → Complex III → Cytochrome c → Complex IV → O₂
B) FADH₂ → Complex I → CoQ → Complex III → Cytochrome c → Complex IV → O₂
C) NADH → Complex I → Complex II→ Complex III → Cytochrome c → Complex IV → O₂
D) FADH₂ → Complex II → CoQ → Complex III → Cytochrome c → Complex IV → O₂
E) A and D