The correct answer is: a) NH 31
NH 31 is a national highway in India that connects Shillong, the capital city of Meghalaya, to Guwahati, the largest city in Assam. The highway is 400 kilometers long and passes through the states of Meghalaya, Assam, and Arunachal Pradesh. It is a two-lane highway for most of its length, but it is being upgraded to a four-lane highway in some sections.
NH 31 is an important highway for the economy of the region. It connects the two major cities of Shillong and Guwahati, and it is also a major route for trade between India and Bangladesh. The highway is also a popular tourist destination, as it passes through some of the most beautiful scenery in the region.
The other options are incorrect because they do not connect Shillong to Guwahati.
- NH 37 connects Silchar, the second largest city in Assam, to Imphal, the capital of Manipur.
- NH 40 connects Chennai, the capital of Tamil Nadu, to Kolkata, the capital of West Bengal.
- NH 54 connects Agartala, the capital of Tripura, to Silchar, the second largest city in Assam.