If an area has low rainfall and high water demand, which measure is more suitable?

Correct answer: Rainwater harvesting and efficient irrigation

The direct answer is A: rainwater harvesting and efficient irrigation are suitable measures. When rainfall is low but water demand is high, the aim must be to collect more water, reduce waste and use available water carefully. The reasoning is: capture rain during the wet period, store it for later use, deliver water near plant roots through efficient methods such as drip irrigation, and select crops and schedules appropriate to local water supply. Option A addresses both supply and saving. Option B is wrong because compulsory water-intensive crops increase demand and can empty groundwater. Option C is wrong because ignoring sources allows leakage, pollution and overuse. Option D is wrong because a flood warning deals with an excess-water emergency, not the normal problem of limited water and high demand. Other planning may also help, but among these choices A is the complete practical response. Memory cue: in a dry area, collect every drop and waste less.