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

The property 'spatial relation' applies to instances of 'geometrical object', and 'region' is a subclass of 'geometrical object'. Which class can appear as the value of 'spatial relation' for instances of 'region'?

A. titration
B. percentile
C. geometrical object
D. environmental index

Answer: geometrical object