Some Chemical Energy Is Not Converted to New Biomass as Energy

Multiple Choice

Some chemical energy is not converted to new biomass as energy is transferred between trophic levels.Which of the following best describes the fate of the unconverted energy?

A) It is all undigested and excreted as feces,so it is not passed on to higher trophic levels.
B) It is only used by organisms to maintain essential processes like cellular respiration.
C) It is converted during cellular respiration to heat helping the heterotroph to stay warm.
D) It is eliminated as feces or released as heat to satisfy the second law of thermodynamics.
E) It is recycled by decomposers to a form that is once again usable by primary producers.