When you look at the figure, imagine shading segment NQ one color and segment PM another color. Which segment along the line would have both colors shaded?
Remember that the answer to the question should include all the points that they share, not just the points that are labeled. The part with both colors shaded would be all the points between N and P, including N and including P.
Another way to say this is that segment NQ and segment PM have the segment NP in common.