A right rectangular prism has a length of 6 inches, a width of 7 inches, and a height of 8 inches. If a plane slices the prism in half, parallel to its smallest face, which of the following describes the shape of the two-dimensional cross-section?
 A.
 a 7-inch by 7-inch square
 B. 
 a 7-inch by 8-inch rectangle
 C. 
 a 6-inch by 8-inch square
 D. 
 a 6-inch by 7-inch rectangle