The correct answer is: Rocky.
The soil of mountainous areas of Haryana is rocky. This is because the mountains are made of rocks, and the soil that forms on top of them is made up of small pieces of rock that have been broken down over time by weathering and erosion. The soil in mountainous areas is also typically very thin, as there is not much space for it to accumulate. This makes it difficult to grow crops in mountainous areas, as the soil is not very fertile.
The other options are incorrect because they do not describe the soil of mountainous areas of Haryana accurately. Black soil is a type of soil that is found in the Deccan Plateau of India. Yellow soil is a type of soil that is found in the Ganges Plain of India. Clay soil is a type of soil that is found in many parts of India, including Haryana.
I hope this helps! Let me know if you have any other questions.