A Cell Can Be Prepared from Copper and Tin $\degree$ _cell for the Cell That Forms from the Following Half-Reactions

A cell can be prepared from copper and tin. What is the E $\degree$ _cell for the cell that forms from the following half-reactions?

A) 0.47 V
B) 0.21 V
C) -0.21 V
D) -0.47 V
E) 0.42 V