Task: Property Constraint Reasoning (ontology: Arts_Media_Entertainment/VideoGameOntology)

The property 'is achieved in session' applies to instances of 'Achievement', and 'Veteran' is a subclass of 'Achievement'. Which class can appear as the value of 'is achieved in session' for instances of 'Veteran'?

A. Character
B. Agent
C. Session
D. instantaneous event

Answer: Session