Task: Property Constraint Reasoning (ontology: Earth_Environment/EnvironmentOntology)

The property 'realized in response to stimulus' applies to instances of 'realizable entity', and 'role' is a subclass of 'realizable entity'. Which class can appear as the value of 'realized in response to stimulus' for instances of 'role'?

A. adiabatic process
B. electron acceptor
C. material entity
D. processed material

Answer: material entity