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The correct answer is option 4, which is "3 only".
The question asks which molecule has a cage-like structure, and the correct molecule is fullerenes. Fullerenes are a form of carbon molecules that consist of hollow cages or spheres. These molecules are made up of carbon atoms arranged in a unique pattern that forms a three-dimensional shape with pentagonal and hexagonal faces. This structure gives fullerenes their cage-like appearance.
Diamond and graphite, on the other hand, do not have a cage-like structure. Diamond is composed of carbon atoms arranged in a rigid, repeating three-dimensional lattice structure, while graphite consists of layered sheets of carbon atoms arranged in a two-dimensional hexagonal lattice.
Therefore, the correct answer is option 4, as only fullerenes have a cage-like structure.