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

The property 'orthogonal to' applies to instances of 'direction', and 'tilt' is a subclass of 'direction'. Which class can appear as the value of 'orthogonal to' for instances of 'tilt'?

A. direction
B. pseudomatrix
C. bluff
D. pyroclastic

Answer: direction