What Is the Equilibrium Concentration of Cl ^- (aq) in a Solution

Multiple Choice

What is the equilibrium concentration of Cl ^- (aq) in a solution that is initially 0.0200 M solution in CuNO₃ and 0.450 M HCl(aq) ?
Cu⁺(aq) + 3 Cl ^- 0(aq) fi CuCl₃^{2 -} (aq) K_f = 5.0 * 10⁵

A) 0.450 M
B) 2.0 * 10 ^{- 6} M
C) 0.390 M
D) 0.430 M
E) 5 * 10⁵ M