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Passage: Pakistan is among the countries facing the most severe water scarcity in the coming decades, driven by population growth, inefficient irrigation, and melting glaciers that feed major rivers. Experts recommend investing in water storage infrastructure and public awareness campaigns to reduce wastage at the household level, warning that current consumption patterns are unsustainable in the long run. Question: According to the passage, what is one cause of water scarcity mentioned?
A. A decline in population
B. Melting glaciers that feed major rivers ✅
C. Too much water storage infrastructure
D. Excessive rainfall