A constant current (0.5 amp) is passed for 1 hour through (i) aqueous AgNO3, (ii) aqueous CuSO4 and (iii) molten AlF3, separately. The ratio of the mass of the metals deposited on the cathode is
[MAg, MCu, MAl are molar masses of the respective metals]
(A) MAg : 2 MCu : 3 MAI
(B) MAg : MCu : MAI
(C) 6 MAg : 3 MCu : 2 MAl
(D) 3 MAg : 2 MCu : MAl
