Which of the Following Processes Is a Step in the Born-Haber

Which of the following processes is a step in the Born-Haber cycle of KF?

A) K⁺(g) + F^-(g) $\rightarrow$ KF(s)
B) K(s) $\rightarrow$ K⁺(g) +e^-
C) K(g) + 1/2 F₂ (g) $\rightarrow$ KF(g)
D) 1/2F ₂(g) +e^- $\rightarrow$ F^-(g)
E) K⁺(aq) + ^-(aq) $\rightarrow$ KF(s)