The correct answer is C. Telangana Plateau.
A zamindari was a type of land tenure system in India under which a large landowner, known as a zamindar, held a large tract of land from the government in return for a fixed revenue payment. The zamindari system was abolished in India in 1950, but it had a significant impact on the development of Telangana.
The Telangana Plateau is a region in the Indian state of Telangana. It is a highland plateau that is located between the Eastern Ghats and the Deccan Plateau. The Telangana Plateau is a major agricultural region, and it is also home to a number of important historical and cultural sites.
The Telangana Plateau was the region in Telangana that had a significant concentration of zamindaris. The zamindars were a powerful class of landowners who controlled much of the land in the region. They were responsible for collecting taxes from the peasants and for maintaining law and order. The zamindari system was abolished in 1950, but it had a lasting impact on the development of Telangana.
The other options are incorrect because they do not refer to regions in Telangana that had a significant concentration of zamindaris.
A) Coastal Andhra is a region in the Indian state of Andhra Pradesh. It is located on the eastern coast of India, and it is a major agricultural region.
B) Eastern Ghats is a mountain range that runs along the eastern coast of India. It is a major watershed, and it is home to a number of important forests and wildlife sanctuaries.
D) River valleys are areas of land that are located along the banks of rivers. They are often fertile and well-watered, and they are home to a number of important agricultural and industrial centers.