Why Does the Efficiency of Sugar Production Decrease When Stomata

Multiple Choice

Why does the efficiency of sugar production decrease when stomata are closed in C3 plants?

A) Accumulated oxygen outcompetes carbon dioxide for rubisco's active site.
B) Depleted carbon dioxide outcompetes oxygen for rubisco's binding site.
C) Accumulated oxygen inhibits rubisco's function.
D) Depleted carbon dioxide inhibits rubisco's function.
E) Depleted carbon dioxide activates rubisco's function.