Given \[E{{{}^\circ }_{C{{u}^{2+}}/Cu}}=0.34V,\,E{{{}^\circ }_{C{{u}^{2+}}/Cu}}=0.15V\] Standard electrode potential for the half cell \[C{{u}^{+}}/Cu\] is

• A. 0.38 V              
• B. 0.53 V
• C. 0.19 V              
• D. 0.49 V