Calculate the K_sp for Li₃PO₄ if at Equilibrium the Concentration $\times$

Calculate the K_sp for Li₃PO₄ if at equilibrium the concentration of PO₄^3- ion is 3.30 $\times$ 10^-3 M.

A) 3.2 $\times$ 10^-9
B) 3.6 $\times$ 10^-10 M
C) 1.2 $\times$ 10^-10 M
D) 5.7 $\times$ 10^-2 M
E) 8.3 $\times$ 10^-4 M