Which of the following is a compensation point:

1. A Option A: Leaves respire and utilize O2 and release CO2.
2. B Option B: Photosynthesis and respiration occur at same rate. So there is not net exchange of gases between atmosphere and plants.
3. C Option C: Rate of photosynthesis increases, so do the O2 production, with a net release of oxygen coupled with the uptake of CO2.
4. D Option D: Rate of respiration becomes more than rate of photosynthesis.

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