Why is the movement of carbon monoxide (CO) primarily limited by diffusion?

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It has a strong affinity for binding with hemoglobinThe partial pressure of CO in the lungs is lowCO has poor solubility in waterThe alveolar membrane restricts its passageNone of the above

Explanation

The transport of CO is mainly diffusion-limited because it binds very strongly to hemoglobin, which reduces the partial pressure of CO in the blood and limits its diffusion rate.