Solubility of CaF2 is 2.0×10-4 gdm-3 then Ksp of CaF2 is_______________?

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Solubility of CaF2 is 2.0×10-4 gdm-3 then Ksp of CaF2 is_______________?

A. 4.0 x 10-8
B. 3.2 x 10-11
C. 2.0 x 10-8
D. 4.0 x 10-12