A half-marathon is 13.1 miles long. There is a water station every 1 11/20 miles along the race trail. Which expression represents the total number of water stations?

A) 13.1 - 1 11/120
B) 13.1 + 1 11/120
C) 13.1 (1 11/120)
D) 13.1 ÷ 1 11/120