A pyramid has a square base A B C D and vertex E. The area of square A B C D is 196 , and the areas of \triangle A B E and \triangle C D E are 105 and 91, respectively. What is the volume of the pyramid?

**Answer Choices**

A. 392

B. 196 \sqrt{6}

C. 392 \sqrt{2}

D. 392 \sqrt{3}

E. 784