Which statements about the conservation of carbon in Earth’s four spheres must be true? Select all the correct statements.

A. If the amount of carbon stored in the hydrosphere increases in a year, then the amount stored in Earth’s other spheres must also increase.

B. If the amount of carbon going into the atmosphere is increasing, then the total amount stored in Earth’s other spheres must be decreasing.

C. If the amount of carbon in the geosphere does not change, then the amount going into the geosphere must equal the amount that goes out of it.

D. If the amount of carbon leaving the biosphere equals the amount leaving the hydrosphere, then the amount entering both spheres must be the same.

E. If the amount of carbon in the atmosphere and the amount in the hydrosphere both increase one year, then the total amount in the biosphere and the geosphere must decrease.