Predict the Molar Solubility of the Following Salt in an Aqueous

Predict the molar solubility of the following salt in an aqueous solution that contains the given concentration of one of its ions:
AgI;[I^-] = 7.2 × 10^-6 M;K_sp = 8.5 × 10^-17

A) 2.4 × 10^-11 M
B) 9.2 × 10^-9 M
C) 1.7 × 10^-6 M
D) 2.7 × 10^-4 M
E) 1.2 × 10^-11 M