The correct answer is d only.

• The Climatic Regions of Rajasthan by Koeppen are Four.
  • Aw
  • BShw
  • BWhw
  • Cwg

• Aw:
  • It is Tropical Humid region.
  • This type of climate is found in the southern part of the Rajasthan.
  • It covers the areas of Dungarpur, Banswara, Chittorgarh and Jhalawar.
  • Here the temperature range is as follows.
    • Summer - 30-34 degree
    • Winter - 12-15 degree
  • Yearly Rain - 80 cm i.e. 800 mm 
  •  Vegetation - 
    • Deciduous trees of Monsoon type
    • Dense
    • Savanna like region
    • Arid Tropical grassland
  • In Mount Abu, the average rainfall is 150 cm.
• BShw:
  • It is Semi-Arid.
  • It is found in the Western side of Aravali.
  • It covers the areas of Barmer, Jalore, Jodhpur, Nagore, Churu, Sikar, Jhunjhunu.
  • Average Rainfall - 20-40 cm
  • Here the temperature range is as follows.
    • Summer - 32-35 degree
    • Winter - 5-10 degree
  •  Vegetation -
    • Steppe
      • In physical geography, a steppe is an ecoregion characterized by grassland plains without trees.
    • Thorny bushes and grasses.
• BWhw:
  • It is the Arid Hot Desert region.
  • It covers the areas of Jaisalmer, Bikaner, Shriganganar, Hanumangarh.
  • Average Rainfall - 10-20 cm
  • Here the temperature is as follows.
    • Summer - 35 degree
    • Winter - 12-18 degree
    • Vegetation -
      • Vegetation less
      • Scanty Rainfall
      • Tough environment
      • Process of evaporation is very active.
• Cwg:
  • It is Sub Humid, Monsoonal type.
  • It is located at the southeastern part of the Aravali.
  • Areas - Hadoti, Mewat and Dang areas i.e Rajsamand, Bhilwara, Tonk, Dausa, Sawai Madhopur, Alwar, Bharatpur, Dholpur, Kota, Baran, Northern Chittorgarh.
  • Here Bhihad is found.