In the rectangular prism above, BF = 20 units, EF = 11 units, and BC = 9 units. If the rectangular prism is divided into two parts by a plane parallel to face DCGH, which of the following best describes the resulting cross-section of the prism?

A. a rectangle with a length of 20 units and a width of 9 units
B. a rectangle with a length of 11 units and a width of 9 units
C. a square with side lengths of 20 units
D. a rectangle with a length of 20 units and a width of 11 units