release of carbon into the atmosphere release of oxygen into the atmosphere cycling phosphorus into the soil cycling hydrogen into the soil
I gave my students this multiple choice question: Overuse of soil for farming causes local disruptions of several Earth subsystems. Which of these is a part of the biogeochemical cycle that experiences the most severe local disruption?

Only one answer is correct among these 4 choices:
- release of carbon into the atmosphere
- release of oxygen into the atmosphere
- cycling phosphorus into the soil
- cycling hydrogen into the soil

Could you tell me which one is correct?

cycling phosphorus into the soil