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

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

A. neurotransmitter
B. material entity
C. metabolite
D. amplitude of temperature of air

Answer: material entity