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Option 3: "They help in the formation of new islands and prevent bleaching."
Explanation: This option is correct as it captures two key points from the text. The speaker mentions that tropical storms create sediments that contribute to the formation of new land (islands) and that they cool down the water, which is crucial in preventing coral bleaching during hot months.
Option 1: "They provide a source of fresh water for the reefs."
Explanation: This option is incorrect because the text does not mention fresh water as a benefit of tropical storms for coral reefs. Instead, it focuses on the destructive and constructive effects, as well as the cooling of water, which prevents bleaching.
Option 2: "They only have destructive effects on the reefs."
Explanation: This option is incorrect because the text explicitly states that tropical storms have both destructive and constructive effects. The use of 'only' in this option contradicts the speaker's explanation of the dual nature of the storms' impact.
Option 4: "They increase water temperature, promoting coral growth."
Explanation: This option is incorrect because the text states that tropical storms cool down the water, which helps prevent bleaching, rather than increasing the temperature. Therefore, this option misrepresents the effects of tropical storms on coral reefs.
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