Which Statement About the Respiratory Electron Transport Chain Is True

Which statement about the respiratory electron transport chain is true?

A) Electrons are received from NADH only.
B) Electrons are passed from donor to recipient carrier molecules in a series of oxidation-reduction reactions.
C) The terminal electron acceptor is usually H₂O.
D) Most of the respiratory proteins are in the cytosol.
E) Energy must be added to move electrons from one electron carrier to the next.