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

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

A. material entity
B. soil percolation rate
C. oceanic transient tracer
D. immaterial entity

Answer: material entity