Once NADH and FADH₂ Have Delivered Their Electrons and Hydrogen

Multiple Choice

Once NADH and FADH₂ have delivered their electrons and hydrogen ions to the electron transport chain,they

A) pick up water molecules.
B) are shipped out of the mitochondria to be used by other organelles.
C) pick up carbon dioxide molecules.
D) pick up more hydrogen ions.
E) pick up oxygen molecules.