Which of the following compounds will have the highest molar solubility in pure water?

a. PbS, Ksp = 9.04 × 10^-29
b. CuS, Ksp = 1.27 × 10^-36
c. Al(OH)3, Ksp = 3 × 10^-34
d. ZnS, Ksp = 1.6 × 10^-24
e. Ag2S, Ksp = 8 × 10^-4