K_sp for PbF₂ Is 4

Multiple Choice

K_sp for PbF₂ is 4.0 ×10^-8.If a 0.032 M NaF solution is saturated with PbF₂,what is [Pb²⁺] in solution?

A) 4.1 × 10^-11 M
B) 1.3 × 10^-9 M
C) 1.3 × 10^-6 M
D) 1.2 × 10^-3 M
E) 3.9 × 10^-5 M