In the diagram, square P Q R S has side length 40 . Points J, K, L, and M are on the sides of P Q R S, as shown, so that J Q=K R=L S=M P=10. Line segments J Z, K W, L X, and M Y are drawn parallel to the diagonals of the square so that W is on J Z, X is on K W, Y is on L X, and Z is on M Y. What is the area of quadrilateral W X Y Z ?
Answer Choices
A. 280
B. 200
C. 320
D. 240
E. 160