D
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
In the carbon cycle, carbon moves from reservoir to reservoir as various organic and inorganic processes occur on Earth. Only a small percentage of the global carbon is moved in this cycle each year. The remaining carbon is stored in these reservoirs. Which reservoir contains the greatest amount of stored carbon?

### Choices:
A. plant biomass
B. the atmosphere
C. fossil fuels
D. the deep ocean

### Answer:
