In the carbon cycle, carbon molecules are exchanged between the natural carbon reservoirs of rocks, soil, plants, fossil fuels, and the ocean. Which of the following is NOT an important exchange between two reservoirs?
A
from the atmosphere to the hydrosphere, in which gaseous carbon dioxide dissolves into the oceans

B
from the atmosphere to fossil fuels, in which gaseous carbon dioxide forms minerals at Earth's surface

C
from the hydrosphere to fossil fuels, in which ocean sediments are compressed into rock on the ocean floor

D
from fossil fuels to the atmosphere, in which emissions from cars and industry release gaseous carbon dioxide