Answer : 2. "दक्षिण एशिया"
Explanation :

Solution: A recently released UN report revealed that South Asia has a higher number of children facing hardships due to severe water scarcity due to climate change than any other region globally. According to a report by the UN children's agency, a staggering 347 million children under the age of 18 in South Asia are affected by staggeringly high or extreme water scarcity, the highest figure among all global regions.