Answer:
D) Diamondene is only two atoms thick.
Step-by-step explanation:
Diamondene is a nanoparticle of carbon that consists of only two carbon atoms that are sp2 and sp3 atoms.
The two-layered structure of diamondene is obtained by giving pressure to two or more layers of graphene in the presence of particular chemical groups such as hydrogens or hydroxyl groups.
Diamondene has many applications such as superconductivity, biosensing and diamondene nanotubes (DNTs).
Hence, the correct answer is "D) Diamondene is only two atoms thick."