The correct option is C Arunachal Pradesh
In the Union Budget 2018, the Union Finance Minister Arun Jaitley has announced the governments plan to build a tunnel through the Sela Pass located at an elevation of 13,700 ft which will ensure faster movement of troops in Tawang, a strategically- located town in Arunachal Pradesh bordering China. The proposal to build the Sela pass comes amid concerns in the defence establishment over Chinas growing assertiveness along the nearly 4,000 km-long Sino-India border. The Sela pass is located between the Tawang and West Kameng districts of Arunachal Pradesh and considered crucial from strategic perspective.