The Molar Solubility of BaCO₃ (K_sp = 1 $\times$ 10^-9)in 0 $\times$

The molar solubility of BaCO₃ (K_sp = 1.6 $\times$ 10^-9) in 0.10 M BaCl₂ solution is:

A) 1.6 $\times$ 10^-10
B) 4.0 $\times$ 10^-5
C) 7.4 $\times$ 10^-4
D) 0.10
E) none of these