Why do you think the processes of photosynthesis and respiration are interrelated?

because in plants, both photosynthesis and respiration are continuous processes that take place through day and night
because the oxygen produced in photosynthesis is used in respiration, and the carbon dioxide produced in respiration is used in photosynthesis
because the energy released during respiration is used in photosynthesis, and the energy released during photosynthesis is used in respiration