Calculate $\Delta$ _rG ^$\circ$ for the Disproportionation Reaction of Cu⁺ at 25

Multiple Choice

Calculate $\Delta$ _rG ^$\circ$ for the disproportionation reaction of Cu⁺ at 25 ^$\circ$ C,
2 Cu⁺(aq) $\to$ Cu²⁺(aq) + Cu(s)
Given the following thermodynamic information.
Cu⁺(aq) + e^- $\to$ Cu(s) $~~~~~~~~$ E ^$\circ$ = +0.518 V
Cu²⁺(aq) + 2 e^- $\to$ Cu(s) $~~~~~~~~$ E ^$\circ$ = +0.337 V

A) -165 kJ/mol.rxn
B) -135 kJ/mol.rxn
C) -34.9 kJ/mol.rxn
D) +17.5 kJ/mol.rxn
E) +135 kJ/mol.rxn