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

The property 'produces' applies to instances of 'material entity', and 'environmental material' is a subclass of 'material entity'. Which class can appear as the value of 'produces' for instances of 'environmental material'?

A. cohesion
B. physiological role
C. indicator
D. material entity

Answer: material entity