In which condition can a water crisis be serious even in a low-density area?

Correct answer: When water sources are very limited and the climate is dry

Correct answer: A. Water crisis depends on the availability, reliability, quality and accessibility of water, not only on the number of people per square kilometre. A low-density region can still face serious scarcity if rainfall is low, the climate is dry, rivers or groundwater are limited, or water sources are far from settlements. People may then have difficulty obtaining enough safe water even though relatively few people live there. A is correct because it combines limited supply with dry conditions. B describes abundance, so it does not support a crisis. C means households already have access to safe water. D generally increases water availability, although other factors can still matter; it is not the best answer here. Memory cue: low density does not guarantee plenty of water; compare population demand with usable supply.