The figure above is a regular hexagon with

问题：

The figure above is a regular hexagon with center H, The shaded area is a parallelogram that shares three vertices with the hexagon; its fourth vertex is the center of the hexagon. If the length of one side of the hexagon is 8 centimeters, what is the area of the unshaded region ？（）

A.A

B.B

C.C

D.D

E.E