In passing `3F` of electricity through three electrolytic cells connect in series containing `Ag^(o+),Ca^(2+),` and `Al^(3+)` ions, respectively. The molar ratio in which the three metal ions are liberated at the electrodes is
A. `1:2:3`
B. `2:3:1`
C. `6:3:2`
D. `3:4:2`