The correct option is B 16.0 g
By Faradays second law of electrolysis,
If equal amount of charge (Q) is passed through two different solutions, the amount of substance deposited/liberated (W) is proportional to their chemical equivalent weights (E).
Thus,
W1W2=E1E2=Z1Z2
Weight of CuWeight of H2=Equivalent weight of CuEquivalent weight of H2
Weight of Cu0.504=63.5/22/2
Weight of Cu =16 g