The correct answer is D. Alluvial soils are mostly found in Telangana along river valleys.
Alluvial soils are formed by the deposition of sediments from rivers and streams. They are typically rich in nutrients and organic matter, making them ideal for agriculture. Alluvial soils are found in many parts of the world, but they are particularly common in river valleys.
In Telangana, alluvial soils are found along the banks of the Godavari and Krishna rivers. These soils are some of the most fertile in the state, and they are used to grow a variety of crops, including rice, cotton, and sugarcane.
The other options are incorrect because they are not areas where alluvial soils are typically found. Mountain slopes are typically covered in rocky, infertile soils. Low plateau areas are often covered in sandy or clayey soils. Coastlines are typically covered in sandy or silty soils.
I hope this helps! Let me know if you have any other questions.