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

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

A. famine
B. material entity
C. microbial community
D. agrochemical

Answer: material entity