Passage: "Mangrove forests grow along sheltered coasts where rivers meet the sea. Their tangled roots slow down waves and trap mud, which protects nearby villages from storm surges and erosion. Mangroves are also nurseries for fish and crabs, so fishing families depend on them. Yet many mangrove areas in the country were cleared for fishponds in past decades. Today, local governments and communities are replanting mangroves, but experts warn that seedlings must be planted only where mangroves naturally grow, or most of them will die." What is the main idea of the passage?
Correct answer: A. Mangroves are important to coasts and communities and should be restored correctly.
The passage explains why mangroves matter (protection from surges and erosion, fish nurseries), notes their loss, and ends with how they should be replanted. Only the first option covers the whole passage.
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