Concept:Respiration is the process by which living cells release energy from food.Explanation:All living plant cells require energy to carry out life activities.Respiration occurs in every living cell, not in only one part of the plant.Stomata and lenticels are involved in gaseous exchange, but they are not the only sites of respiration.Aerobic and anaerobic respiration can both take place in plant cells.Since all living cells have cytoplasm and enzymes for respiration, the process is diffuse throughout the plant body.Answer:C. All living cells