Victor cut four congruent triangles off the corners of a rectangle to make a hexagon, as shown below.

A rectangle that is 28 c-m long and 16 c-m wide has right triangles cut out from all four corners each with height and base length of 8 c-m.

What is the area of the shaded hexagon?
A.

B.

C.

D.

D. 192 cm^2