What Is the Solubility, in Moles Per Liter, of PbSO₄

What is the solubility, in moles per liter, of PbSO₄ (K_sp = 6.3 × 10^-7) in 0.0230 molar MgSO₄ solution?Hint: Be sure to account for the presence of a common ion. You should also be able to simplify the math, because the solubility is very low.

A) 2.14 × 10^-5
B) 7.24 × 10^-5
C) 2.74 × 10^-5
D) 4.72 × 10^-5
E) 4.27 × 10^-5