The correct answer is c. Nimbus Cloud
They are special clouds because they are the ones that bring heavy rain. The word "nimbus" actually means "rain" in Latin. These clouds are thick and dark because they are full of water droplets. When you see nimbus clouds in the sky, it usually means a storm or heavy rain is coming. Unlike other clouds, nimbus clouds are low and spread out, covering the sky like a blanket, which is why they can drop so much rain at once.
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