Each of the following regarding redox couples is true EXCEPT:

A) standard reduction potentials are measured relative to a standard hydrogen cell (H⁺/H₂)
B) for cells in which electrons flow toward the sample half-cell, the reduction potential is positive
C) a redox couple consists of a substance being oxidized, and the substance oxidizing it
D) a half-reaction involving the loss of electrons is an oxidation reaction
E) all are true statements.