The rectangular flag shown is divided into seven stripes of equal height. The height of the flag is h and the length of the flag is twice its height. The total area of the four shaded regions is 1400\:cm^2. What is the height of the flag?
Answer Choices
A. 70\:cm
B. 200\:cm
C. 35\:cm
D. 1225\:cm
E. 14\:cm