The correct option is D Petroleum
Petroleum is a hydrocarbon, that means it contains only carbon and hydrogen. It is formed from the remains of plants and tiny animals that settled down at the bottom of ancient oceans. These remains were covered by layers of mud and sand. Gradually, over millions of years, the weight of these accumulating layers built up great pressure and heat. This caused the sediments to get converted into crude oil and on distillation of crude oil, we get petroleum. The other options given are allotropic forms of carbon.