The figure above represents a window, with

问题：

The figure above represents a window, with the shaded regions representing openings for glass and the pale regions representing the wood panels between and around the glass. If the window is 4.5 feet high by 2.5 feet wide, and if each of the wooden panels is exactly 4 inches thick, what is the total surface area, in square inches, of glass in the window ？（）
(1 foot=12 inches; figure not drawn to scale)

A. 189

B. 378

C. 448

D. 756

E. 1,620