The correct answer is option 2, Indus Valley civilization. The people of the Indus Valley civilization were innovative in their approach to urban planning and infrastructure. They built the world`s first drainage system, which consisted of a complex network of sewerage and drainage pipes that effectively managed waste and wastewater in their cities. This drainage system was designed to prevent flooding and ensure the cleanliness of the city streets. The advanced engineering and planning skills demonstrated by the Indus Valley civilization in creating this drainage system highlight their sophisticated understanding of urban living and public health. The other options, namely Egyptian civilization, Chinese civilization, and Mesopotamian civilization, although significant in their own right, were not credited with the world`s first drainage system.