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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: According to the passage, what threat has increased tourism created?
A. A decline in guesthouse business
B. Litter and unregulated construction on trekking routes ✅
C. Reduced visitor interest in the region
D. Fewer guided treks being offered
