The answer would be choice "C"
There are 3 feet in one yard, so let's find the minimum and maximum feet it could be.
Minimum: 5 x 3 = 15 feet, the problem says that it is BETWEEN 5 and 6 yards, so it has to be over 15 feet, which eliminates choice "B".
Maximum: 6 x 3 = 18 feet, so it would have to be less then 18 feet, which eliminates choices "A" and "D", leaving just "C" left.