A machinist creates a washer by drilling a hole through the center of a circular piece of metal . If the piece of metal has a radius of X+10 and the hole has a radius of X+6, what is the area of the washer ?

A) x^2 - 8piX - 64 pi
B) x^2 + 8piX -64 pi
C) 8 piX - 64 pi
D) 8pi X + 64 pi

Thank you !