What are petrochemicals?

The correct answer is option 2. materials obtained from petroleum refining.

Petrochemicals are materials obtained from petroleum refining. They are chemical compounds derived from crude oil or natural gas. These substances play a crucial role in the production of a wide range of products, including plastics, synthetic rubber, fibers, solvents, fertilizers, pharmaceuticals, and various chemicals used in manufacturing processes. The correct option from your provided choices is Materials obtained from petroleum refining.