Rank the Following Metal Sulfides in Order of Increasing Molar

Multiple Choice

Rank the following metal sulfides in order of increasing molar solubility in water.
Salt
K_sp
CoS
4 × 10^-21
CuS
6 × 10^-36
FeS
6 × 10^-18
HgS
1) 6 × 10^-52
MnS
2) 5 × 10^-10

A) MnS < FeS < CoS < CuS < HgS
B) FeS < HgS < CoS < CuS < MnS
C) HgS < CuS < CoS < FeS < MnS
D) CuS < CoS < FeS < MnS < HgS
E) CoS < CuS < FeS < HgS < MnS