George takes a photograph of a rectangular window that is 3 1/2 feet tall and 1 3/4 feet wide. He prints the photograph on paper so that the image of the window is 1/2 foot tall and 1/4 foot wide. What is the ratio of the area of the window to the area of the image of the window?

A. 1:49

B. 1:7

C. 7:1

D. 49:1