Which of the following industries is its own major consumer in India?

Correct option is D

The chemical industry is its own largest consumer. Basic chemicals undergo processing to further produce other chemicals that are used for industrial application, agriculture or directly for consumer markets.
The iron and steel industry plays a crucial role in India's economic growth and industrial development, serving as a backbone for several other industries.
Consumers of other three industries are given below:
Aviation: Passenger Airlines, Cargo Airlines, Military, Business/Private Jets.
Automobile: Individuals, Ride-sharing Companies, Car Rental Companies, Fleet Management Companies, Governments.
Iron and Steel: Construction, Automotive & Transportation, Energy, Machinery.