A prominent national highway connecting major cities in Karnataka:

NH 44
NH 7
NH 66
NH 544

The correct answer is: B) NH 7

NH 7 is a national highway in India that runs from Kanyakumari in Tamil Nadu to Silchar in Assam. It is one of the longest national highways in India, with a total length of 2,369 km. The highway passes through the states of Tamil Nadu, Kerala, Karnataka, Andhra Pradesh, Telangana, Odisha, West Bengal, and Assam.

In Karnataka, NH 7 passes through the cities of Bangalore, Hubli-Dharwad, Belgaum, and Mangalore. It is a major highway in the state and connects the major cities of Karnataka.

The other options are incorrect because:

  • NH 44 is a national highway in India that runs from Surat in Gujarat to Chennai in Tamil Nadu. It is one of the busiest national highways in India.
  • NH 66 is a national highway in India that runs from Kanyakumari in Tamil Nadu to Goa. It is a major highway in the southern states of India.
  • NH 544 is a national highway in India that runs from Bangalore in Karnataka to Salem in Tamil Nadu. It is a major highway in the southern states of India.