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

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

A. marine biota
B. glaciation
C. atmospheric process
D. material entity

Answer: material entity