The correct option is D +0.38 V
The disproportionation reaction of Cu+ is
2Cu+→Cu2++Cu(s)
Here,
Oxidation reactions is
Cu+→Cu2++e− (anode)
Reduction reaction is
Cu++e−→Cu (Cathode)
Standard EMF of cell is,
E0cell=E0cathode−E0anode
E0cell=E0Cu+/Cu−E0Cu2+/Cu+
E0cell=0.53−0.15
E0cell=0.38 V