The most plausible explanation for the location of the Thar desert in western India is....

• A. the absence of mountains to the north of Rajasthan to cause orographic rainfall in it
• B. the evaporation of moisture by heat
• C. that the moisture carried by the South-west monsoon is driven away by the dry upper air current
• D. the obstruction caused by the Aravalis to the rain-bearing wind that proceeds to the Ganga Valley