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Passage: Smog has become a recurring problem in several Pakistani cities during the winter months, reducing visibility and causing respiratory issues. Vehicle emissions, crop burning, and industrial smoke all contribute to the thick haze that settles over urban areas. Environmentalists warn that without coordinated action across provinces, the situation will likely worsen each passing year. Question: What does the passage suggest about solving the smog problem?
A. It is not a serious concern
B. It can be solved by one city acting alone
C. It requires cooperation between different provinces ✅
D. It has already been solved