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

The property 'temporally related to' applies to instances of 'occurrent', and 'process boundary' is a subclass of 'occurrent'. Which class can appear as the value of 'temporally related to' for instances of 'process boundary'?

A. obsolete plant-associated habitat
B. physiological role
C. occurrent
D. obsolete cream

Answer: occurrent