Which one of the following ancient towns is well-known for its elaborate system of water harvesting and management by building a series of dams and channelizing water into connected reservoirs?

Option a is the correct answer. The ancient city of Dholavira is one of the most remarkable and well-preserved urban settlements in South Asia dating from the 3rd to mid-2nd millennium BCE (Before Common Era). Discovered in 1968, the site is set apart by its unique characteristics, such as its water management system, multilayered defensive mechanisms, extensive use of stone in construction and special burial structures. It has a complex system for collecting and storing rain water within several reservoirs. Planners in the ancient city of Dholavira had conceptualised an amazing system of drains, dams and tanks to manage water.