The correct answer is: a) Chennai and surrounding areas.
Chennai Metro Rail is a rapid transit system serving the city of Chennai, Tamil Nadu, India. It is the first metro rail system in the state of Tamil Nadu and the fourth metro rail system in India. The first phase of the Chennai Metro Rail was inaugurated on 29 May 2015. The second phase of the Chennai Metro Rail is under construction and is expected to be completed by 2023.
The Chennai Metro Rail system consists of two lines, Line 1 and Line 2. Line 1 is 45.12 km long and has 32 stations. Line 2 is 32.17 km long and has 24 stations. The Chennai Metro Rail system is operated by Chennai Metro Rail Limited (CMRL).
The Chennai Metro Rail system is a major public transportation system in Chennai. It provides a fast and reliable way to travel around the city. The Chennai Metro Rail system is also a major tourist attraction.
The other options are incorrect because they are not cities in Tamil Nadu where the Chennai Metro Rail system operates.