Correct Answer : Option (D) - Vivek Express
The Vivek Express, running from Dibrugarh in Assam to Kanyakumari in Tamil Nadu, currently holds the title of the longest train route in the country, both in terms of distance and time.
The train, along its way, crosses a total of nine states. With 58 stops, the train goes through Assam, Nagaland, Bihar, West Bengal, Jharkhand, Odisha, Andhra Pradesh, Kerala, and Tamil Nadu.
The announcement of the Vivek Express was made in 2011 during the presentation of the railway budget for 2011-12 by Mamata Banerjee, the then Railway Minister of India. The train route was established to commemorate the 150th birth anniversary of Swami Vivekananda..Source : News18