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Passage: Rapid urban migration has placed enormous strain on housing and infrastructure in cities like Karachi and Lahore. Informal settlements have expanded quickly to accommodate newcomers, often lacking proper sanitation or legal land ownership. City planners argue that without affordable housing schemes, these settlements will continue growing unchecked, deepening existing inequalities across the wider urban population. Question: What is the main idea of the passage?
A. Urban migration is outpacing housing infrastructure, expanding informal settlements ✅
B. Informal settlements always have proper sanitation
C. Karachi and Lahore have stopped growing
D. City planners have solved the housing crisis
