The correct answer is: B. NH-3
NH-3 is the longest national highway in Himachal Pradesh. It is a two-lane highway that runs from Delhi to Srinagar. The highway passes through the states of Haryana, Punjab, Himachal Pradesh, and Jammu and Kashmir. The total length of NH-3 in Himachal Pradesh is 464 kilometers.
NH-154 is a national highway in India that runs from Shimla to Mandi. The highway is 175 kilometers long and is a part of the Golden Quadrilateral project.
NH-5 is a national highway in India that runs from Surat in Gujarat to Srinagar in Jammu and Kashmir. The highway is 2,700 kilometers long and is one of the longest national highways in India.
NH-7 is a national highway in India that runs from Kanyakumari in Tamil Nadu to Srinagar in Jammu and Kashmir. The highway is 2,360 kilometers long and is one of the longest national highways in India.