Most Energy Transfers in Cells Involve a Linked Set of Oxidation

Most energy transfers in cells involve a linked set of oxidation and reduction reactions.This means that ______________.

A) one molecule gains an electron while retaining its original set of electrons
B) one of the reacting molecule loses an electron while the second molecule picks it up and passes it to a third molecule
C) one molecule is oxidized and one is reduced in a set of coupled reactions
D) the reduced molecule loses an electron and becomes smaller
E) all of these are correct