A fireperson needs to use a ladder of 25 feet in length to rescue a cat that has become
stuck in a tree. The tree is 50 feet high, and the cat is 15 feet off the ground straight up in the
trunk of the tree. How far from the bottom of the tree will the ladder have to be in order to
reach the point at which the cat is?

A.15
B.20
C.25
D.30
E.135