What Is the Molar Solubility of PbF₂ in a Buffer $\times$

What is the molar solubility of PbF₂ in a buffer solution in which the [H⁺] concentration is roughly constant at 0.080 M ? (K_sp of PbF₂ is 3.2 $\times$ 10^-8; K_a of HF = 6.8 $\times$ 10^-4.)

A) 8.4 $\times$ 10^-3
B) 7.4 $\times$ 10^-3
C) 3.2 $\times$ 10^-3
D) 1.1 $\times$ 10^-4
E) 4.8 $\times$ 10^-2