What Is the Molar Solubility of Barium Fluoride ( BaF₂

What is the molar solubility of barium fluoride ( BaF₂ ) in water? The solubility- product constant for BaF₂ is 1.7 × 10^{- 6} at 25°C.

A) 1.2 × 10^{- 2}
B) 1.8 × 10^{- 3}
C) 5.7 × 10^{- 7}
D) 6.5 × 10^{- 4}
E) 7.5 × 10^{- 3}