The correct option is C A city built on the concept of sustainable economic development.
A smart city is a highly developed urban area that creates sustainable economic development and high quality of life by providing the best facilities concerning the economy, transport, environment, as well as people and their lifestyles. It works by gathering information by using information and communication technologies in various aspects of the city. Smart cities incorporate technology into the way the city is run so that the citizens can have better access to amenities.