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

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

A. propellant
B. surfactant
C. material entity
D. allergen

Answer: material entity