Introduction of electrons to the electron transport chain

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Introduction of electrons to the electron transport chain

With the introduction of electrons to the Electron Transport Chain, the first molecules in the chain present in NADH dehygrogenase complex, would be __________ when the electron as passed to the next molecule?

1. reduced then oxidized
2. dephohphorylated then phosphorylated
3. phosphorylated then decarboxylated
4. oxidized then reduced

Can you please explain why the answer is what it is? I have been trying to use the book and I just cant get it. I have a test coming up and any help would be so greatly appreciated. Will rate best answer for sure…..