What Happens in Photorespiration That Is More Energetically Costly Than

What happens in photorespiration that is more energetically costly than the Calvin cycle?

A) Rubisco's active site combines with oxygen instead of carbon dioxide.
B) Rubisco's active site combines with carbon dioxide instead of glucose.
C) Rubisco's active site combines with water instead of carbon dioxide.
D) Rubisco's active site combines with glucose instead of oxygen.
E) Rubisco's active site combines with glucose instead of carbon dioxidE.