The correct response is: The carbon in carbon dioxide is recycled during photosynthesis.
During photosynthesis, plants take in carbon dioxide (CO2) from the atmosphere. Through a series of biochemical reactions, including the Calvin cycle, the carbon from CO2 is fixed and incorporated into organic molecules, ultimately leading to the formation of glucose and other carbohydrates. This process effectively recycles carbon from inorganic sources (carbon dioxide) into organic forms that can be used by the plant and other organisms.