38. Consider the standard galvanic cell at 25 ℃ based on the following half-reaction:

The electrodes in this cell are Ag(s) and Cu(s). Which of the following changes will make thecell potential decrease?
(A) CuSO4(s) is added to the copper half-cell compartment (assume no volume change).
(B) NH3(ag) is added to the copper half-cell compartment.
(C) NaCl(s) is added to the silver half-cell compartment.
(D) Water is added to both half-cell compartments until the volume of solution is doubled.
(E) The silver electrode is replaced with a platinum electrode.