A family is building a circular fountain in their backyard. The yard is rectangular and measures 14x by 19x and the fountain is going to be circular with a radius of 6x. Once the fountain is built, what will the area of the remaining yard be?
A. 203πx^2
B. 230x^2
C. 266x^2 - 6πx^2
D. 2x^2 (133 - 18π)
(π = Pie)