The C₄cycle ____

The C₄cycle ____.

A) replaces the second stage of the Calvin cycle
B) supplements the activity of rubisco by providing a second source of 3PGA for the reduction stage of the Calvin cycle
C) is more efficient than the Calvin cycle because less ATP is consumed in the process
D) ensures that CO₂is provided to rubisco and thus prevents photorespiration
E) is most commonly associated with plants living in humid climates