Determine the Molar Concentration of the Lead(II)ion in a 26 $\times$

Determine the molar concentration of the lead(II) ion in a 26.0 ppb aqueous solution of lead(II) nitrate [Pb(NO₃) ₂,331.22 g/mol].Assume that the density of the solution is 0.998 g/mL.

A) 7.85 $\times$ 10^-8 M
B) 2.60 $\times$ 10^-8 M
C) 7.85 $\times$ 10^-11 M
D) 7.83 $\times$ 10^-8 M
E) 3.92 $\times$ 10^-8M