43. Under what conditions do photosynthesis and cellular respiration occur in plants? (A) Photosynthesis occurs only in the light, and cellular respiration occurs in both the dark and the light. (B) Photosynthesis and cellular respiration occur only in the light. (C) Photosynthesis occurs only in the light, and cellular respiration occurs only in the dark. (D) Photosynthesis and cellular respiration occur in both the dark and the light.