Concept:Construction lines must be light and easy to erase, so a harder pencil is best.Explanation:Pencil grades range from hard to soft: H pencils are harder and produce lighter lines, while B pencils are softer and darker.Construction lines are temporary guide lines, so they should not be too dark or thick.A 2H pencil is harder than HB and B, making it the most suitable for drawing light construction lines.Answer:D. 2H.