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

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

A. famine
B. season
C. material entity
D. multi-species collection of organisms

Answer: material entity