Biology

The correct answer is: A.Ocean

Explanation:

A carbon sink is a natural or artificial reservoir that absorbs and stores carbon dioxide (CO₂) from the atmosphere. It helps remove and store carbon dioxide (CO₂), playing a critical role in the carbon cycle and in regulating Earth's climate.

A.Ocean: The ocean is the largest carbon sink on Earth. It absorbs and stores a significant amount of CO₂ from the atmosphere, both through physical processes (like diffusion) and biological processes (like photosynthesis by marine plants and plankton). It is estimated that the oceans abso...