Sarah and George went on hiking trip over the weekend to Mt.Shasta. On Saturday they hiked 9/12 mile. On Saturday they hike 4/12 mile. What is the difference between the distances they hiked on Saturday and Sunday?
 A. 1/4 miles
 B. 5/12 miles
 C. 1 and 1/12 miles 
 D. 1/3 miles