Answer:
C) reduced because electrons are gained which produces reduced water
Step-by-step explanation:
The electron transport chain (ETC) involves a series of chemical reaction based on the reduction and oxidation of molecules. According to the question, the electrons that leave the chain combine with a final electron acceptor called Oxygen. This reaction is a reduction reaction because oxygen gains electrons.
The gaining of electrons by Oxygen reduces it to water (H2O). Hence, water is said to be reduced because electrons are gained by oxygen to produce a reduced form, called water.