statements A, B, and D are correct regarding respiration:

• Statement A: In respiration, the energy of oxidation-reduction is utilised for phosphorylation (Oxidative Phosphorylation).
• Statement B: Oxygen acts as the final hydrogen acceptor.
• Statement D: The role of oxygen is limited to the terminal stage of the process.
• Statement C is incorrect for respiration. The text distinguishes respiration from photophosphorylation, stating that in photophosphorylation, light energy (photo-oxidative) is utilised for the production of the proton gradient, whereas in respiration, it is the energy of oxidation-reduction.