The correct answer is option 3: Tamil Nadu. Tank irrigation is a method of irrigation that involves using small reservoirs or tanks to store and distribute water for agricultural purposes. Tamil Nadu, located in the southern part of India, is known for its extensive network of tanks that have been used for irrigation for centuries. These tanks are used to collect rainwater during the monsoon season and provide a reliable source of water for agriculture throughout the year. The tanks in Tamil Nadu are typically interconnected, forming a network that allows for efficient water distribution. This traditional system of tank irrigation has played a crucial role in supporting agriculture in the region and is still widely used today.