Write, in Factored Form, an Expression for the Area of the Shaded

Multiple Choice

Write, in factored form, an expression for the area of the shaded region of the figure below where m is $8$ and n is $18$ .

A) $4 ( 6 - x ) ( 6 + x )$
B) $( 12 - x ) ( 12 - x )$
C) $4 ( 4 - x ) ( 9 - x )$
D) $( 12 + x ) ^ { 2 }$
E) $4 ( 4 + x ) ( 9 - x )$