Structures of carbon allotropes

Steps:

• Identify key properties: buckminsterfullerene (C60) is a discrete spherical molecule with delocalized electrons; graphene is a 2D hexagonal sheet with delocalized pi electrons.
• Evaluate A: both allotropes feature delocalized electrons in pi bonds, not localized.
• Evaluate B: buckminsterfullerene consists of individual C60 molecules, forming a molecular solid, not a giant covalent lattice.
• Evaluate C: graphene's carbon atoms are sp2 hybridized in a planar hexagonal lattice, not tetrahedral (which is sp3, as in diamond).

Not enough information for D.

Why the others are wrong:

• A: Electrons are delocalized in both due to pi bonding.
• B: It is a molecular structure, not giant covalent.
• C: Graphene has a trigonal planar arrangement, not tetrahedral.

Final answer: Not enough information.