The correct answer is (b), West Kameng.
Graphite is a mineral that is used in a variety of applications, including pencils, lubricants, and batteries. It is found in many parts of the world, but one of the largest deposits in India is located in the West Kameng district of Arunachal Pradesh.
The graphite deposit in West Kameng is estimated to be worth billions of dollars. It is currently being mined by the state-owned company, Mineral Exploration Corporation Limited. The mine is expected to produce about 100,000 tonnes of graphite per year.
The graphite deposit in West Kameng is a significant economic resource for Arunachal Pradesh. It is expected to create jobs and boost the state’s economy. The mine is also expected to help India reduce its reliance on imports of graphite.
The other options are incorrect. Option (a), East Kameng, is a district in Arunachal Pradesh that does not have a large graphite deposit. Option (c), Lohit, is a district in Arunachal Pradesh that has a small graphite deposit. Option (d), Subansiri, is a district in Arunachal Pradesh that does not have a graphite deposit.