The correct answer is: A) Bengaluru.
The Namma Metro, also known as the Bangalore Metro, is a rapid transit system serving the city of Bangalore, India. It is the first metro rail system in the state of Karnataka. The first phase of the Namma Metro was inaugurated on 20 November 2011. The system is operated by the Bangalore Metro Rail Corporation Limited (BMRCL).
The Namma Metro has a total length of 42.3 km and consists of two lines: the Green Line and the Purple Line. The Green Line runs from Nagasandra to Yelachenahalli, while the Purple Line runs from Baiyappanahalli to Mysuru Road. The Namma Metro has 30 stations, of which 26 are underground and 4 are elevated.
The Namma Metro is a major public transportation system in Bangalore. It is used by millions of people every day. The metro has helped to reduce traffic congestion and improve air quality in the city. It has also made it easier for people to commute to work and school.
The Namma Metro is a well-designed and efficient system. It is clean and comfortable, and it is easy to use. The metro is a great way to get around Bangalore.
The other options are incorrect because they are not cities in Karnataka where a metro rail project has been launched.