The correct answer is: B. Patna
The East Central Railway Zone is one of the 18 railway zones of Indian Railways. It is headquartered in Patna, Bihar. The zone was formed on 1 April 1952 by merging the Patna and Danapur divisions of the Eastern Railway. It covers an area of 100,000 square kilometers and has a total route length of 4,500 kilometers. The zone has 10 divisions: Danapur, Bhagalpur, Gaya, Jehanabad, Khulna, Malda, Mughalsarai, Patna, Saharsa, and Sonpur. The zone operates a fleet of over 3,000 locomotives and 100,000 wagons. It carries over 1.5 billion passengers and 50 million tonnes of freight annually.
The headquarters of East-Central Railway Zone is located at Patna, Bihar. Patna is the capital of Bihar and the 19th largest city in India. It is located on the banks of the Ganges River. Patna is a major cultural and educational center. It is home to several universities, including Patna University, the oldest university in India. Patna is also a major commercial center. It is home to several industries, including textiles, engineering, and pharmaceuticals.
The other options are incorrect because they are not the headquarters of East-Central Railway Zone. Hajipur is a city in Bihar. It is located on the banks of the Ganges River. Hajipur is a major railway junction. It is also a major commercial center. Muzaffarpur is a city in Bihar. It is located on the banks of the Gandak River. Muzaffarpur is a major educational center. It is home to several universities, including the University of Muzaffarpur. Katihar is a city in Bihar. It is located on the banks of the Kosi River. Katihar is a major commercial center.