Calculate the Value of the Equilibrium Constant for the Reaction

Calculate the value of the equilibrium constant for the reaction AgCl(s) + 2NH₃(aq) Ag(NH₃) ₂+(aq) + Cl ^- (aq)
Given K_sp = 1.6*10 ^{- 10} for silver chloride and K_f = 1.6 *10⁷ for the ammonia complex of Ag⁺ ions,Ag(NH₃) ²⁺.

A) 1.0 *10 ^{- 17}
B) 6.3 *10⁹
C) 6.3 *10 ^{- 8}
D) 1.0 * 10¹⁷
E) 2.6 *10 ^{- 3}