Most Primary Production Does Not Pass Through the Live Consumer

Multiple Choice

Most primary production does not pass through the live consumer system.Which of the following is correct relative to this statement?

A) Much primary production dies without being grazed and supports the decomposer system.
B) Not all primary productivity is assimilated to biomass because a proportion is lost to respiratory heat.
C) Plant biomass that is eaten by herbivores and herbivore biomass eaten by carnivores is not entirely incorporated into consumer biomass. What is not used is lost in feces and is used by the decomposer system.
D) All primary productivity is grazed.