Turn it into a (different) Extensive Form Game by having first the row player act and then the column player act after seeing what the row player did. Thus the game has 4 non-terminal histories: the one where the row player acts and then the three where the column player acts (after each possible row player action). Find all the Subgame Perfect Nash Equilibria of this game.

\begin{tabular}{c|c|c|c|} & L & M & R \\ \hline U & 1,9 & 3,4 & 5,6 \\ \hline C & 2,3 & 4,2 & 7,7 \\ \hline D & 3,3 & 8,4 & 0,4 \\ \hline \end{tabular}