Which one of the following cannot be considered a decomposer? 

• Decomposers are organisms that feed on dead decaying matter and release nutrients back into the atmosphere in the form of simpler chemicals.
• Fungi, bacteria, earthworms, and dung beetles are decomposers that feed on decaying waste.
• Hyenas are carnivores that hunt living animals and cannot be considered decomposers. 

Hence, C is the correct answer.