Which among the following National Highway routes is the longest?

1. The question asks for the longest National Highway route among the given options, based on the old numbering system prevalent in 2004. 2. (A) Agra-Mumbai corresponds largely to NH 3 (Old). Length approx 1161 km. 3. (B) Chennai-Thane (near Mumbai) corresponds largely to NH 4 (Old). Length approx 1235 km. 4. (C) Kolkata-Hajira (near Surat, Gujarat) corresponds largely to NH 6 (Old). Length approx 1949 km. 5. (D) Pune-Machilipatnam corresponds largely to NH 9 (Old). Length approx 841 km. Comparing the approximate lengths, the Kolkata-Hajira route (Old NH 6) was the longest among the given options.