Ebony is making a scale drawing of her farm. The farm has a circular well with a circumference of 4 feet. In the drawing, the circumference of the well will be 1.6 centimeters. What scale is Ebony using?
A. 2.5 cm = 1 ft
B. 1.6 cm = 1 ft
C. 1 cm = 2.5 ft
D. 1 cm = 1.6 ft