Final answer:
To bisect a segment means to split it into two equal parts at its midpoint, which does not involve rotation or changing the segment's length.
Step-by-step explanation:
To bisect a segment means to split the segment into two equal parts at its midpoint. This is typically done by drawing a line, called the bisector, that goes through the midpoint of the segment and creates two segments that are congruent (meaning they have the same length). The correct choice from the given options would be C) The segment is split into two equal parts at its midpoint. The act of bisecting does not involve rotation or changing the length of the segment, which eliminates options B and D. When you bisect a segment, you are applying one of the basic constructions in geometry, which often serves as a part of constructing other geometric figures or proving certain properties about them.