Evelyn walks on a treadmill for at least 1 hour but not more than 2 hours. She walks at an average rate of 3.5 miles per hour. The distance Evelyn walks in t hours is represented by a function.
r(t)= 3.5t
What is the practical domain of the function?

A.All real numbers.

B.All multiples of 3.5 between 3.5 and 7, inclusive.

C.All real numbers from 1 to 2, inclusive.

D.All integers from 1 to 2, inclusive.