I asked a question a while ago about vertically aligning enumerate labels to the top of table. Now I am having the same problem, but with images. Since my problem was solved in my previous thread, I tried sticking the image in a single-cell table and aligning that with the tabular's alignment parameter, but it seemed to have no effect.
Can someone explain what is the correct way to align this image and why didn't sticking it in a table work as expected? I am simply trying to align the enumerate label with the top of my image.

\begin{enumerate}[label=(\alph*)]
\item\begin{tabular}[t]{l}\includegraphics[width=10cm]{13a.png}\end{tabular}
\end{enumerate}
|149 error| Illegal unit of measure (pt inserted). \relax ...udegraphics[valign=t,width=10cm]{13a.png}. Any ideas what that is about? – nw. Oct 03 '11 at 18:04adjustbox. You can since use the following again:\includegraphics[width=10cm,valign=t]{13a.png}. Note that the order of the options influences the alignment. Ifvalignis used firstwidthwill also scale the height and depth. – Martin Scharrer Feb 05 '13 at 22:42