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

The property 'P20 had specific purpose' applies to instances of 'E7 Activity', and 'E85 Joining' is a subclass of 'E7 Activity'. Which class can appear as the value of 'P20 had specific purpose' for instances of 'E85 Joining'?

A. E4 Period
B. E74 Group
C. E5 Event
D. E72 Legal Object

Answer: E5 Event