which of these statements most accurately describes how carbon dioxide enters a leaf

Hi, I have a question and I hope anyone could answer it:

Which of these statements most accurately describes how carbon dioxide enters a leaf?

A. CO2 is pulled in by leaf veins.

B. CO2 is carried by water in leaf veins.

C. CO2 defuses by way of the stomata.

D. CO2 enters a leaf through osmosis.

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