Out of the following salts identify the one which has maximum solubility (in M) :
(P) Barium sulphate having `K_(sp)=1.1xx10^(-10)`
(Q) Aluminium phosphate having `K_(sp) =6.3xx10^(-19)`
(R ) Cadmium iodate having `K_(sp)=3.2xx10^(-8)`
(S) Cuprous chloride having `K_(sp) =1.2xx10^(-6)`
A. Aluminium phosphate
B. Cuprous chloride
C. Barium sulphate
D. Cadmium iodate