Explanation:

- NH-44: This is the correct answer. NH-44 is the longest national highway in India. It stretches from Srinagar in the north to Kanyakumari in the south, covering around 3,745 kilometers.

- NH-102: This is a relatively short highway located in the northeastern part of India, specifically in Manipur.

- NH-22: Previously known for its scenic beauty, NH-22 runs through Himachal Pradesh and ends in Punjab. It is not as long as NH-44.

- NH-7: Previously considered the longest, NH-7 was renumbered as part of NH-44 after the rationalization of highway numbers.