Which of the Following Statements About Voltaic and Electrolytic Cells $\Delta$

Which of the following statements about voltaic and electrolytic cells is correct?

A) The anode will definitely gain weight in a voltaic cell.
B) Oxidation occurs at the cathode of both cells.
C) The free energy change, $\Delta$ G, is negative for the voltaic cell.
D) The electrons in the external wire flow from cathode to anode in an electrolytic cell.
E) None of the above statements is correct.