If the distance between a 13 feet ladder and a vertical wall is 5 feet along the ground, how high can a person climb if the ladder is inclined against the wall ?

Question

$\begin{array}{1 1} (a)\;\text{18 feet} \\ (b)\; \text{65 feet} \\ (c)\;\text{ 12 feet} \\ (d)\; \text{10 feet} \end{array}$