Which of the Following Is True of Detritivores

Which of the following is true of detritivores?

A) They recycle chemical elements directly back to primary consumers.
B) They synthesize organic molecules that are used by primary producers.
C) They convert organic materials from all trophic levels to inorganic compounds usable by primary producers.
D) They secrete enzymes that convert the organic molecules of detritus into CO2 and H2O.
E) Some species are autotrophic, whereas others are heterotrophic.