Why is displacement around a track 0?

Why is displacement around a track 0?

wer: D. displacement is a measure of how far you travelled from the starting point. Since a runner on a track starts and finishes at the same place, their displacement is zero. This is why A and C are wrong. B is also incorrect, because runners usually run in a single direction around a track. Even if they ran backwards to the finish line their displacement would still be zero.