In the carbon cycle, the human body directly returns carbon to the atmosphere through this way:

Formation of glucose

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Urination

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Photosynthesis

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Cellular respiration

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Solution

The correct option is D Cellular respiration
A considerable amount of carbon returns directly to the atmosphere as ${CO}_{2}$ through the respiratory activities of the humans.
Glucose is formed from carbon dioxide majorly through photosynthesis. This process involves the fixation of atmospheric ${CO}_{2}$ . Other bodily processes such as gluconeogenesis can lead to the formation of glucose from noncarbohydrate sources such as glucogenic amino acids. This also does not directly lead to the release of ${CO}_{2}$ into the atmosphere.
Urination is the process by which urine is released by any ureotelic organism. This also does not directly release ${CO}_{2}$ into the atmosphere.
Humans are heterotrophs hence they do not perform photosynthesis

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