Answer:
The best answer to the question: Where is the greatest amount of the world´s carbon found, would be: the seafloor sediments, where the ocean deposits this element.
Step-by-step explanation:
Although the most logical answer to this question would be the atmosphere, given that carbon is present in the form of carbon dioxide, the reality, and according to research done, is that carbon, as an element is present most of all in the ocean and it is the seafloor sediments that have become the biggest reservoirs of elemental carbon.