Decomposers are important because they break down waste and return nutrients to the environment. Thus, the correct option is B.
Decomposers may be defined as microorganisms that convert the dead plants and animals into humus. They are also known to decompose organic waste material in the environment.
After breaking down the dead organic waste material into an inorganic form, this inorganic form of nutrition is consumed by primary producers very effectively.
Therefore, the correct option for this question is B.
To learn more about Decomposers, refer to the link:
https://brainly.com/question/380333
#SPJ5