GRE Question of the Day (October 7th)

In two Equilateral parallelograms, A and B, the sum of the lengths of the diagonals of A is equal to the sum of the lengths of the diagonals of B. In A, the length of the longer diagonal is 20 more than the length of the shorter diagonal. In B, the length of the longer diagonal is 8 more than the length of the shorter diagonal. What is the area of B minus the area of A?


A. 336
B. 168
C. 84
D. 42
E. 0