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

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

A. generation of precursor metabolites and energy
B. material entity
C. Bronsted base
D. chemical engineering process

Answer: material entity