GMAT Sentence Correction (SC) | Re: The distance between the two runners, which is over 50

The distance between the two runners, which is over 50 meters , cannot be made up with only three laps to go in the race.

A)The distance between the two runners, which is over 50 meters
B) The distance between the two runners, who is over 50 meters
C) The distance between the two runners, whom is over 50 meters
D) The distance between the two runners, that is over 50 meters
E) The distance between the two runners, whoever is over 50 meters

B, C, and E are thrown out because the relative pronoun