The correct answer is option 3, Chennai or Madras. A port is considered artificial when it is created or significantly modified by humans for the purpose of facilitating trade and transportation. Chennai, formerly known as Madras, is one such port in India. It is located on the Coromandel Coast of the Bay of Bengal and is a major hub for container traffic. Chennai Port plays a crucial role in the import and export of goods, contributing to the country`s economy. Other options mentioned, such as Kandla, Mangalore, and Haldia, are all natural ports that have not undergone significant human modifications.