Solid having only line segments as its edges is a

Option (a) a polyhedron is the solid is made up of polygonal region called faces and these faces meet at edges called line segments and the edges meet at vertices are called point. So it has only line segments as its edge.

(b)Cone does not have only line segment. It is connecting with line and a half line also.

(c) Cylinder having two plane surfaces meeting at the point.

(d) Polygon also contain plane surface not only the line segment.