A Photosynthetically Active Plant in Moist Soil and Full Sun

Multiple Choice

A photosynthetically active plant in moist soil and full sun is respiring rapidly. What would be the NET carbon cycle status of this plant at this point in time?

A) It is a net exporter of carbon, returning large amounts of carbon to the atmosphere via respiration.
B) There is no net gain or loss of carbon; the plant both accumulates and returns carbon to the carbon cycle at roughly equal rates.
C) It is a net accumulator of carbon, converting atmospheric carbon primarily into ATP, NADPH and FADH₂.
D) It is a net exporter of carbon, returning large amounts of carbon to the atmosphere via the decomposition of dead and decaying plant matter.
E) It is a net accumulator of carbon, converting atmospheric carbon primarily into carbohydrates.