Your town's public library is building a new wheelchair ramp to its entrance. By law, the maximum angle of incline for the ramp is 4.76°. The ramp will have a vertical rise of 1.5 ft. What is the shortest horizontal distance that the ramp can span.

a) 11.5 ft.
b) 2.6 ft.
c) 7.1 ft.
d) 18.0 ft.