In which situation will the environmental effect of population change be clear?

Correct answer: The population rises and pressure on water, land, and waste management increases

The direct answer is A. A growing population usually needs more drinking water, homes, food, roads, energy, and land. It also produces more wastewater and solid waste. If water supply, land-use planning, sewage treatment, and waste management do not keep pace, environmental pressure can become visible through shortages, pollution, congestion, or degradation of land and water. A is correct because it connects a demographic change with realistic resource use and waste-management needs. B is wrong because “the height of the sky” is not a normal measurable environmental effect of population change. C is impossible and unrelated to population geography. D is too absolute and is not a necessary result; soil can be degraded or covered by construction, but it does not simply disappear everywhere. Memory cue: more people mean more resource demand and more waste, unless planning manages them properly.