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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: In the passage, the word ‘influx’ most nearly means:
A. A type of mountain trail
B. A government regulation
C. A gradual decline in numbers
D. A large or sudden arrival of people ✅
