Which of the following substances has the greatest solubility in water?
A) CdS, Ksp = 1.0 x 10⁻²⁴
B) CuCI, Ksp = 1.9 x 10⁻⁷
C) PF₂, Ksp = 3.6 x 10⁻⁸
D) Ball, O3/2, Ksp = 1.5 x 10⁻⁹
E) SrSO₄, Ksp = 3.2 x 10⁻⁷