The Alternative Pathways of Photosynthesis Using the C₄ or CAM

Multiple Choice

The alternative pathways of photosynthesis using the C₄ or CAM systems are said to be compromises. Why?

A) Each one minimizes both water loss and rate of photosynthesis.
B) C₄ compromises on water loss and CAM compromises on photorespiration.
C) Both minimize photorespiration but expend more ATP during carbon fixation.
D) CAM plants allow more water loss, while C₄ plants allow less CO₂ into the plant.
E) C₄ plants allow less water loss but CAM plants allow more water loss.