The Owners of the Rectangular Swimming Pool in the Illustration

Multiple Choice

The owners of the rectangular swimming pool in the illustration want to surround the pool with a crushed-stone border of uniform width. They have enough stone to cover 68 square meters. How wide should they make the border? ( Hint : The area of the larger rectangle minus the area of the smaller is the area of the border.)

A) 1.5 m
B) 3.5 m
C) 1 m
D) 2.5 m
E) 0.5 m