15. Given the following values of equilibrium constants: \( Cu(OH)_2(s) \rightleftharpoons Cu^{2+}(aq) + 2OH^-(aq) \) \( K_{sp} = 1.6 \times 10^{-19} \) \( Cu(NH_3)_4^{2+}(aq) \rightleftharpoons Cu^{2+}(aq) + 4NH_3(aq) \) \( K = 1.0 \times 10^{-13} \) What is the value of the equilibrium constant for the following reaction? \( Cu(OH)_2(s) + 4NH_3(aq) \rightleftharpoons Cu(NH_3)_4^{2+}(aq) + 2OH^-(aq) \) (A) \( 1.6 \times 10^{-19} \) (B) \( 1.6 \times 10^{-6} \) (C) \( 6.2 \times 10^{31} \) (D) \( 1.6 \times 10^{-32} \) (E) \( 1.0 \times 10^{13} \)