What is the limit of water availability for a region to be classified as water-stressed region?

Correct option is A

A region is classified as water-stressed when the availability of water is less than 1700 cubic meters per person per year. This classification is based on the Falkenmark Water Stress Indicator, a widely used method of measuring water scarcity. According to this indicator, when water availability is less than 1700 cubic meters per person per year, the region faces water stress, indicating that it is starting to encounter water scarcity issues. When the availability drops below 1000 cubic meters per person per year, the region is considered to be experiencing water scarcity