Concept:Graphite’s lubricating property comes from its internal crystal structure.
Explanation:Graphite consists of flat layers of carbon atoms arranged in hexagonal sheets.
The layers are held together by weak van der Waals forces.
These weak forces allow the layers to slide over one another easily.
So, when graphite is used as a dry lubricant, its layered structure reduces friction.
Mobile electrons and free electrons explain electrical conductivity, not lubrication.
Octahedral structures are not present in graphite.
Answer:D. layered structures