The correct option is D both a and c
During photosynthesis, there is an evolution of O2 during the splitting of water molecules. O2 is not used.
Photorespiration is the wasteful process of oxygenation of RuBP and release of CO2 by the photosynthetic organs of a plant. Here O2 is utilized.
During anaerobic respiration, O2 is not used, since partial breakdown of sugars occurs in the absence of O2.