Final answer:
The correct step to bisect a segment AB using paper folding is to fold the paper so that point A aligns with point B, creating a fold that marks the midpoint when unfolded.
Step-by-step explanation:
The correct answer to the question is OB. Fold the paper such that point A and point B coincide with one another. In order to bisect a segment AB, the process of paper folding involves aligning point A directly onto point B so that when the paper is unfolded, there will be a crease that represents the bisector - the line that divides the segment AB into two equal parts. This folding method ensures that each half of the segment AB is of equal length, indicating that the fold is the exact midpoint (bisector) of the segment AB.