Answer the following question given this paragraph: 

Water erosion by runoff, rivers, and streams dissolves carbon in rocks and carries it to the ocean. Ocean water near the surface dissolves carbon dioxide from the atmosphere. Dissolved carbon may be stored in the deep ocean for thousands of years.


Q: How many years can dissolved carbon be stored in the deep ocean?

 Choices:

- unknown

- hundreds

- tens

- thousands

A:
thousands
