The correct response is:
The system can't keep up because we produce too much Carbon Dioxide.
While the carbon cycle is a natural process that regulates the Earth's carbon levels, human activities, such as burning fossil fuels and deforestation, have significantly increased the amount of carbon dioxide released into the atmosphere. This excess CO2 overwhelms the carbon cycle's ability to sequester and utilize it, leading to an increase in greenhouse gas concentrations and contributing to climate change.