Which Statement Is True Concerning an Oxidation-Reduction Reaction

Multiple Choice

Which statement is true concerning an oxidation-reduction reaction?

A) The reactant which is reduced is the oxidizing agent.
B) The reactant which is oxidized is the oxidizing reagent.
C) The reactant which gains electrons is the reducing agent.
D) The reactant which loses electrons is the oxidizing agent.
E) None of the statements, A-D, is true.