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

The property 'causal relation between processes' applies to instances of 'occurrent', and 'temporal region' is a subclass of 'occurrent'. Which class can appear as the value of 'causal relation between processes' for instances of 'temporal region'?

A. biophysical role
B. occurrent
C. epitope
D. obsolete plant-associated habitat

Answer: occurrent