The correct answer is: C) Nalgonda.
Nalgonda district is known for its extensive canal network. The canals were built during the Nizam rule to irrigate the fields and provide water for drinking and other purposes. The canals are a major source of water for the people of Nalgonda district.
Warangal district is known for its historical monuments, such as the Warangal Fort and the Thousand Pillar Temple. Karimnagar district is known for its coal mines and its industrial development. Nizamabad district is known for its cotton production and its agricultural produce.
The canal network in Nalgonda district is one of the largest in the state of Telangana. The canals are a major source of irrigation for the fields in the district. The canals also provide water for drinking and other purposes. The canals are a major asset for the people of Nalgonda district.