For the disproportionation of copper :$2Cu^+\rightarrow Cu^{+2}+Cu$, Eº is : - (Given Eº for $\frac{Cu^{+2}}{Cu}$ is 0.34 V & Eº for $\frac{Cu^{+2}}{Cu^+ }$is 0.15 V :

Question

( A ) 0.49 V
( B ) – 0.19 V
( C ) – 0.38 V
( D ) 0.38 V