Concept:Crude oil is used to make many products, and petrol is only one of its major uses.
Explanation:Petrol is mainly used to produce energy in the transport sector.
If petrol is no longer needed for energy, this biggest source of crude oil demand will fall sharply.
However, crude oil is still required to produce chemicals, plastics, lubricants, and other industrial materials.
So the demand for crude oil will not disappear completely, but it may become limited mainly to chemical industries.
It will not increase, remain constant, or make producing countries richer.
Answer: C. may be limited to chemical industries