The correct answer is: a) Guwahati.
The Gauhati Metro is a rapid transit system currently operational in Guwahati, the largest city in the Indian state of Assam. The system consists of one line, the North-South Line, which is 18.1 kilometers (11.2 mi) long and has 12 stations. The line opened on November 29, 2018.
The Gauhati Metro is operated by the Guwahati Metro Rail Corporation (GMRC). The GMRC is a joint venture between the Government of India and the Government of Assam. The GMRC was established in 2003 to implement the Gauhati Metro project.
The Gauhati Metro is a fully automated system. The trains are driverless and are controlled by a central control system. The trains are also equipped with a number of safety features, including collision avoidance systems and fire detection systems.
The Gauhati Metro is expected to reduce traffic congestion in Guwahati and improve the quality of life for the city’s residents. The system is also expected to boost economic activity in the city.
The other options are incorrect because they are not cities in Assam where the Gauhati Metro is operational.