The coagulating power of electrolytes having inos `Na^(o+),Al^(3+)` and `Ba^(2+)` for arsenic sulphide sol increases in the order
A. `Na^(+)ltBa^(2+)ltAl^(3+)`
B. `Ba^(2+)ltNa^(2+)ltAl^(3+)`
C. `Al^(3+)ltNa^(+)ltBa^(2+)`
D. `Al^(3+)ltBa^(2+)ltNa^(+)`