The correct answer is D) All of the above.
The Geological Survey of India (GSI) is a government agency under the Ministry of Mines and Steel of the Government of India. It is responsible for geological surveys, mapping, and mineral exploration in India. The GSI was established in 1851 and is headquartered in Kolkata.
The Telangana State Mineral Development Corporation (TSMDC) is a government corporation under the Department of Mines and Geology of the Government of Telangana. It is responsible for mineral exploration, development, and production in Telangana. The TSMDC was established in 2014 and is headquartered in Hyderabad.
The Singareni Collieries Company Limited (SCCL) is a government-owned coal mining company in India. It is the largest coal producer in India and the second largest coal producer in Asia. The SCCL was established in 1956 and is headquartered in Hyderabad.
All three organizations are responsible for mineral exploration and development in Telangana. The GSI is responsible for geological surveys and mapping, while the TSMDC and SCCL are responsible for mineral exploration, development, and production.