Which processes represent respiration? Process A and Process C
Process B and Process D
Process A and Process D
Process B and Process C

The title of the diagram is Carbon Cycle. There are three rectangles at the three corners of a triangle. The top rectangle is labeled Atmosphere, the right rectangle is labeled Plants, and the left rectangle is labeled Animals. An arrow labeled Process A points from Animals to Atmosphere. An arrow labeled Process B points from the Atmosphere to Plants. An arrow labeled Process C points from Plants to Atmosphere. An arrow labeled Process D points from Plants to Animals.