The correct option is D Petrochemicals
Petrochemicals are organic chemicals while others are inorganic chemicals. The chemical industries produce both organic and inorganic chemicals. Organic chemicals include petrochemicals, which are used in manufacturing of synthetic fibres, synthetic rubbers, plastics, drugs, and pharmaceuticals. Sulphuric acid, Nitric acid, Alkalies, Soda Ash and Caustic soda are some examples of inorganic chemicals.