Calculate the Equilibrium Constant K_c for the Following Overall Reaction $\leftrightharpoons$

Multiple Choice

Calculate the equilibrium constant K_c for the following overall reaction: AgCl(s) + 2CN^-(aq) $\leftrightharpoons$ Ag(CN) ₂^-(aq) + Cl^-(aq)
For AgCl, K_sp = 1.6 * 10^-10; for Ag(CN) ₂^-, K_f = 1.0 * 10²¹.

A) 1.2 * 10¹¹
B) 1.4 * 10¹¹
C) 1.6 * 10¹¹
D) 1.8 * 10¹¹
E) None of the above