Answer:
B
Step-by-step explanation:
The Carbon Cycle is the cycle of where carbon is circulated all over, from the atmosphere to Earth, and back. Our planet is a closed environment thanks to our atmosphere, and so the density and amount of Carbon in circulation is always the same. Carbon is released to the never ending cycle by volcanoes, fossil fuels, and other natural processes. Most of the Carbon on Earth is stored in rocks and the ground, while the rest is everywhere else.
Hope it helps