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

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

A. eating behavior
B. convective
C. environmental contaminant
D. material entity

Answer: material entity