Two painters each lean their ladders against the same window sill of a house. They each place the base of their ladder the same distance from the base of the wall. If the first ladder is 18 feet long, which statement describes the second ladder?
A. It must have a length of exactly 18 feet.
B. It could have any length less than or equal to 18 feet.
C. It could have any length greater than or equal to 18 feet.
D. Nothing is known about the length of the second ladder.