The correct option is B Guwahati
The first oil pipeline connected the oil field in upper Assam to Kanpur in Uttar Pradesh. It traverses through Guwahati in Assam, Barauni in Bihar and Prayagraj, previously known as Allahabad, in Uttar Pradesh. Whereas, Prayagraj and Babrala are both in Uttar Pradesh and Siliguri is in West Bengal.