(a) Diamond

(b) Graphite

(c) Cumene

(d) Buckminsterfullerene

Solution:

Option (c) is the answer.

Cumene (isopropylbenzene) is an aliphatic-substituted aromatic hydrocarbon. Crude oil and refined fuels both contain it. It’s a colourless, flammable liquid with a boiling point of 152°C.