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Passage: Northern Pakistan’s mountainous valleys have seen a sharp rise in tourism in recent years, boosting local economies through guesthouses and guided treks. Yet the sudden influx of visitors has also strained fragile ecosystems, with litter and unregulated construction threatening some popular trekking routes. Conservationists are urging the introduction of visitor limits to balance tourism growth with environmental protection. Question: What is the main idea of the passage?
A. Growing tourism benefits local economies but threatens the environment ✅
B. Visitor limits have already solved all environmental issues
C. Local economies have not benefited from tourism
D. Tourism in northern Pakistan has completely stopped
