The correct option is C Kolkata
The first regional conference on Mass Rapid Transport System (MRTS) for Urban Areas Opportunities and Challenges was held in Kolkata, West Bengal on March 13,2018. The conference was jointly organized by Ministry of Finance, AIIB, ASSOCHAM and Research and Information System for Developing Countries (RIS). Before the 3rd annual meeting of Asian Infrastructure Investment Bank (AIIB) to be held in Mumbai from June 2018, eight such regional conferences will be held on the issues relating to infrastructures development, sustainable infrastructure, mass rapid transportation system, port and coastal infrastructure, urban development and the like in eight different cities of India.