The correct answer is: The major reservoir of carbon is the ocean.
The ocean contains about 40,000 gigatons of carbon, which is about 50 times more than the amount of carbon in the atmosphere. The ocean is also the largest sink of carbon dioxide, absorbing about 25% of the carbon dioxide that is released into the atmosphere each year.
The ocean is a major reservoir of carbon because it is a large and relatively stable environment. The ocean is also a good place for carbon to be stored because it is not easily released back into the atmosphere.
The ocean is a complex system, and the amount of carbon that it contains is affected by a number of factors, including the temperature of the ocean, the amount of sunlight that the ocean receives, and the amount of carbon dioxide that is released into the atmosphere.
The ocean is a vital part of the Earth’s climate system, and the amount of carbon that it contains is an important factor in determining the Earth’s climate.
The other options are incorrect because they are not major reservoirs of carbon. The atmosphere contains about 780 gigatons of carbon, which is about 10% of the amount of carbon in the ocean. Plant and animals contain about 550 gigatons of carbon, which is about 7% of the amount of carbon in the ocean. Rock contains about 1,500 gigatons of carbon, which is about 22% of the amount of carbon in the ocean.