The correct answer is option 2 i.e Aridisols and Entisols. Aridisols and Entisols extend over the largest area of the Rajasthan. Some important points about given soils are:
Soils
Description
Aridisols
Aridisols are mineral soil mostly found in dry climatic.
These occur extensively in the western half of Rajasthan divided by the Aravalli axis and some part of Alwar, Jaipur and Alwar districts that fall on the eastern half.
Vertisols
Districts - Jhalawar, Kota, Bundi and a small part of Sawai Madhopur, Bharatpur, Dungarpur, Chittorgarh, and Banswara.
Entisols
Entisols lack well-developed horizons and have minimum profile development.
Entisols are dominant soil of the state.
All district in western half is covered in some and major parts by these soils.
Alfisols
Districts- Parts of Bharatpur, Alwar, Sawai Madhopur, Jaipur, Tonk, Bhilwara, Chittorgarh, Banswara, Udaipur, Dungarpur, Bundi, Kota, and Jhalawar.
Inceptisols
Districts- Along with foothill of Arawali in the district of Sirohi, Pali, Bhilwara, Udaipur, Chittorgarh and some parts of alluvial plains in Udaipur, Alwar, Sawai Madhopur, and Jhalawar.