Waiting for Godot by Samuel Beckett was first performed in \(1953\).
Look Back in Anger by John Osborne appeared in \(1956\).
No Man's Land by Harold Pinter appeared in \(1975\).
Cloud Nine by Caryl Churchill appeared in \(1979\).
Therefore, the chronological order is:
\[
\textit{Waiting for Godot} \rightarrow \textit{Look Back in Anger} \rightarrow \textit{No Man's Land} \rightarrow \textit{Cloud Nine}.
\]
So the correct sequence is:
\[
C,\ D,\ B,\ A.
\]