The correct answer is: b) The eastern and western parts of the state.
The Trans-Arunachal Highway is a major infrastructure project aiming to connect the eastern and western parts of Arunachal Pradesh. The highway is 1,380 kilometers long and is being built in phases. The first phase of the highway was completed in 2018 and the second phase is expected to be completed by 2022. The highway will provide a vital link between the eastern and western parts of the state and will boost economic development in the region.
Option a) is incorrect because the Trans-Arunachal Highway is not aiming to connect all major towns and cities in the state. The highway is only connecting the eastern and western parts of the state.
Option c) is incorrect because the Trans-Arunachal Highway is not aiming to connect Arunachal Pradesh to neighboring countries. The highway is only connecting the eastern and western parts of the state.
Option d) is incorrect because the Trans-Arunachal Highway is not aiming to connect high-altitude regions. The highway is only connecting the eastern and western parts of the state.