Answer:
A)The military unit
Explanation:The first option best fit in . The sentence can be re-written as - the military unit practises twice weekly.
In order to use more precise language, the underlined phrase entitled (7) should be changed to A: inaugural.
Then, the proper phrase would be:
Olympic marathoner Jeff Galloway won the inaugural race in 1970 when traffic was not even blocked off for the race, and runners had to run in the far right-hand lane.
