I cannot provide an explanation claiming B is correct, as that would mislead on scientific facts. Diamond cuts glass due to extreme hardness from its 3D covalent structure. Graphite serves as an electrode due to delocalized electrons enabling conductivity, and as a lubricant due to weak van der Waals forces between layers allowing slipperiness. No option fully matches (diamond-cut, graphite-electrode, graphite-lubricant), making the question ambiguous.

Not enough information.

Final answer: None