The length, width, and height of a rectangular prism is a, (a - 7), and (a + 7), respectively. Which statement best describes (a - 7)? A. The width of the rectangular prism is 7 units less than the height. B. The length of the rectangular prism is 7 units less than the width. C. The width of the rectangular prism is 7 units less than the length. D. The height of the rectangular prism is 7 units more than the length.