Correct option is D
- Western Rajasthan is part of the Thar Desert, one of the driest regions in India.
- It receives less than 50 cm of annual rainfall, mostly due to its distance from the Bay of Bengal and Arabian Sea,and the obstruction by the Aravalli hills which run parallel to the monsoon winds, offering minimal orographic support.
Desert National Park is located here, showcasing arid biodiversity.
Vegetation includes thorn forests and xerophytic plants.
The Aravalli Hills block monsoon winds ineffectively.
Major cities like Jaisalmer and Bikaner fall in this zone.
Crops like bajra (millet) are cultivated here due to drought resistance.