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

The property 'produced by' applies to instances of 'material entity', and 'construction' is a subclass of 'material entity'. Which class can appear as the value of 'produced by' for instances of 'construction'?

A. material entity
B. oxidising agent
C. season
D. indicator

Answer: material entity