Marla has a large white cube that has an edge of 10 feet. She also has enough green paint to cover 300 square feet. Marla uses all the paint to create a white square centered on each face, surrounded by a green border. What is the area of one of the white squares, in square feet?
Answer Choices
A. 5 \sqrt{2}
B. 10
C. 10 \sqrt{2}
D. 50
E. 50 \sqrt{2}