The height of a wooden pole, h, is equal to 20 feet. A taut wire is stretched from a point on the ground to the top of the pole.
The distance from the base of the pole to this point on the ground, b, is equal to 15 feet. What is the length of the wire, l?
A. 625 feet
B. 20 feet
C. 13 feet
D. 25 feet