Lead Pipes Were Used at One Time for Delivering Drinking $\times$

Lead pipes were used at one time for delivering drinking water.What is the maximum possible concentration of lead in this water if it comes from lead(II) hydroxide (K_sp = 2.8 $\times$ 10^-16) dissolving from the surface of the pipes? Note that the EPA limit on lead in drinking water is 7.2 $\times$ 10^-8 M.

A) 4.1 $\times$ 10^-6 M
B) 1.6 $\times$ 10^-8 M
C) 6.5 $\times$ 10^-6 M
D) 5.1 $\times$ 10^-6 M
E) 8.3 $\times$ 10^-9 M