Based on the Following Table Compound ______ Has the Largest Energy Difference Between the HOMO

Short Answer

Based on the following table.
$\begin{array} { | c | c | } \hline \text { Compound } & \lambda _ { \max } ( \mathbf { n m } ) \\\hline \mathrm { W } & 190 \\\hline \mathrm { X } & 340 \\\hline \mathrm { Y } & 560 \\\hline \mathrm { Z } & 250 \\\hline\end{array}$
Compound ______ has the largest energy difference between the HOMO and LUMO.