Form a union for the following sets.
k = {2, 3, 5, 8}
l = {3, 5, 7}
a. { }
b. {3, 5}
c. {2, 3, 5, 7, 8}
d. {2, 7, 8}

Three runners competed in a race data were collected at each mile mark for each runner if the runner ran at a constant pace the data would be linear