With the Classification Error Matrix Below, What Is the Overall

With the classification error matrix below, what is the overall accuracy of the land use classification?
$\begin{array}{|l|l|l|l|l|}\hline & \text { Urban } & \text { Forest } & \text { Cropland } & \text { Total } \\\hline \text { Urban } & 7 & 2 & 1 & 10 \\\hline \text { Forest } & 2 & 25 & 8 & 35 \\\hline \text { Cropland } & 3 & 1 & 51 & 55 \\\hline \text { Total } & 12 & 28 & 60 & 100 \\\hline\end{array}$

A) 100%
B) 27.7%
C) 29%
D) 83%