Arrange the following electrolytes in the increasing order of coagulation power for the coagulation of `As_(2)S_(3)` sol :
`K_(2)SO_(4) " " CaCl_(2)" " Na_(3)PO_(4) " " AlCl_(3)`
A. `Ilt II lt IIIlt IV`
B. `I=III lt II lt IV`
C. `II lt IV lt I lt II`
D. ` II lt III lt IV lt I`