The correct answer is: D. NH-27 and NH-31
The East-West Corridor is a national highway in India that runs from Porbandar in Gujarat to Silchar in Assam. It is one of the longest national highways in India, with a total length of 2,345 kilometers. The highway passes through the states of Gujarat, Maharashtra, Madhya Pradesh, Chhattisgarh, Jharkhand, Bihar, West Bengal, and Assam.
In Bihar, the East-West Corridor is a two-lane highway that passes through the cities of Patna, Gaya, and Bhagalpur. The highway is being upgraded to a four-lane highway under the National Highways Development Project.
The following are the national highways that are a part of the East-West Corridor that traverse in Bihar:
- NH-27: This highway runs from Varanasi in Uttar Pradesh to Silchar in Assam. It passes through the cities of Patna, Gaya, and Bhagalpur in Bihar.
- NH-31: This highway runs from Kolkata in West Bengal to Silchar in Assam. It passes through the city of Bhagalpur in Bihar.
The other options are incorrect because they do not include any national highways that are a part of the East-West Corridor that traverse in Bihar.