Answer:
Option D is the correct answer.
Explanation:
The correct answer is midpoint of a segment.
We can find the midpoint of a segment by folding the paper in such a way that the two endpoints of the line segment lie on top of one another.
We can find the angle bisector using the paper folding method by folding the paper in a way, that the rays that make up the angle lie directly on top of one another.
We can find a segment perpendicular to another segment through paper folding by folding the paper in such a way, that the paper is folded through the point and the segment lies on top of itself.