Use the figure to answer the question: Which of the following best explains why no arrows lead directly from "Detritus" to secondary consumers?

A) detritus is living organic material, and primary consumers only eat dead organisms
B) few primary consumers directly eat detritus, and so it is mostly broken down into inorganic compounds by decomposers such as earthworms, fungi, and prokaryotes
C) detritus is toxic prior to being broken down by prokaryotes and fungi
D) detritus is too small to be located by primary consumers