Which Hypothesis About the Benefits of Photorespiration Was Supported by Kozaki

Multiple Choice

Which hypothesis about the benefits of photorespiration was supported by Kozaki and Takeba's experiment with tobacco plants, in which the plants were genetically altered to elevate and lower their rates of photorespiration?

A) Photorespiration takes up the excess O₂ that builds up at high light levels.
B) Photorespiration protects the plant's photosynthetic machinery at high light levels.
C) Photorespiration cools the plant at high light levels.
D) Photorespiration releases CO₂, which in turn increases the rate of photosynthesis.