For the Electrochemical Cell Cu(s)| Cu²⁺ || Ag⁺ | Ag(s),the

For the electrochemical cell Cu(s) | Cu²⁺ || Ag⁺ | Ag(s) ,the standard cell potential is 0.46 V.A cell using these reagents was made,and the observed potential was 0.26 V at 25 ^oC.Which of the following is a possible explanation for the observed voltage?

A) The volume of the Cu²⁺ solution was larger than the volume of the Ag⁺ solution.
B) The volume of the Ag⁺ solution was larger than the volume of the Cu²⁺ solution.
C) The Cu²⁺ concentration was larger than the Ag⁺ concentration.
D) The Ag electrode was twice as large as the Cu electrode.
E) The Ag⁺ concentration was larger than the Cu²⁺ concentration.