Natalie compared the circumference of her bicycle tire to the circumference of the tire on her mother's car. Her bicycle tire had a radius of 10 inches. The car tire had a radius of 18 inches.

What was the difference in the circumferences of the two tires? Use π = 3.14.

A. 8 inches

B. 12.56 inches

C. 25.12 inches

D. 50.24 inches