What is the molar solubility of magnesium oxalate Mg(C2O4 ) in water?

The solubility-product constant for MgC2O4 is 8.6 × 10-5

A) 4.3 × 10-5 mol/L

B) 1.7 × 10 -4 mol/L

C) 8.35 mol/L

D) 1.3 × 10-2 mol/L

E) 9.3 × 10-3 mol/L