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

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

A. katabatic wind
B. direction
C. moraine
D. magma

Answer: direction