What Is the Main Adaptive Advantage of the C4 and CAM

Multiple Choice

What is the main adaptive advantage of the C4 and CAM photosynthesis strategies over the C3 strategy?

A) They make it possible for the plant to use the Calvin cycle at night.
B) They allow the plant to fix carbon more efficiently in dim or cool conditions.
C) They help the plant conserve water and synthesize glucose efficiently under hot,dry conditions.
D) They allow the plant to fix carbon more efficiently under conditions of low atmospheric CO2.