Question

1 It takes 1 cups of sugar and 3 cups of flour

Answer 1

For every 1 cup of sugar there's 3 cups of flour or vice versa. (For every 3 cups of flour there's 1 cup of sugar.)

Answer:

The ratio of sugar to flour is 1 to 3, 1:3, or 1/3.  (Option B)

Hope this helps :)