The width of a rectangle is 3 inches less than its length. The area of the rectangle is 340 square inches. What are the length and width of the rectangle?          A. length = 20 inches, width = 17 inches    B. length = 17 inches, width = 14 inches    C. length = 10 inches, width = 7 inches    D. length = 34 inches, width = 10 inches