Explanation

Blue Carbon refers to the carbon sequestered, stored, and locked away by the world’s marine and coastal ecosystems — specifically mangroves, tidal marshes, and seagrass meadows.

– Although covering less than 0.5% of the ocean floor, coastal marine vegetated habitats account for more than 50% of all carbon stored in ocean sediments.
– They sequester carbon at rates up to 10 times faster than mature terrestrial tropical rainforests, locking it safely beneath waterlogged anaerobic sediments for millennia.
– By contrast, carbon captured by terrestrial forests and soils is known as Green Carbon.

Therefore, the correct definition is Option A.