1994 AJHSME Problems/Problem 23

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Problem

If $X$, $Y$ and $Z$ are different digits, then the largest possible $3-$digit sum for

$\begin{tabular}{ccc} X & X & X \\  & Y & X \\ + & & X \\ \hline \end{tabular}$

has the form

$\text{(A)}\ XXY \qquad \text{(B)}\ XYZ \qquad \text{(C)}\ YYX \qquad \text{(D)}\ YYZ \qquad \text{(E)}\ ZZY$