Which of the following is a function performed by a detrivore

Although the options are not provided, detrivores are organisms that are heterotrophs and obtain nutrients by devouring decaying plant and animal matter as well as feces. These substances are known as detritus. Detrivores are unlike decomposers because decomposers are not able to ingest solid pieces of matter; instead, they release enzymes to break their food down and uptake it on the molecular scale. Examples of detrivores include earthworms, wood lice, sea stars and millipedes.

Most likely a is the answer - because  you generate   38 atp's but also consume an atp.   each atp gives approx. less than 4 kcal so probably a is the closest answer.