15. A children's wading pool, shown below, is in the shape of a right circular cylinder and has a diameter of 6 feet. The pool is filled to a uniform depth of 1. 5 feet. Which of the following values is closest to the volume of water in the pool, in cubic feet?

(Note: The volume of a right circular cylinder is πr²h, where r is the radius of the cylinder and h is the height of the cylinder. )