The Equilibrium Constant at 25 °C for the Dissolution of Silver

The equilibrium constant at 25 °C for the dissolution of silver iodide is
8.5 × 10^-17. AgI(s) $\rightleftharpoons$ Ag⁺(aq) + I^-(aq)
If an excess quantity of AgI(s) is added to water and allowed to equilibrate, what is the equilibrium concentration of I^-?

A) 7.2 × 10^-33 M
B) 4.3 × 10^-17 M
C) 8.5 × 10^-17 M
D) 6.5 × 10^-9 M
E) 9.2 × 10^-9 M