Ben uses a compass and straightedge to bisect segment PQ, as shown: segment PQ with compass open to greater than half of segment PQ

Which statement best explains why Ben must open the compass to a width greater than half of segment PQ?

To be able to create two intersecting arcs above and below the line segment
To be able to create arcs above the line segment
To find the length of the line segment
To find the length of half of the line segment