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

The property 'farther than' applies to instances of 'distance', and 'cyclotron radius' is a subclass of 'distance'. Which class can appear as the value of 'farther than' for instances of 'cyclotron radius'?

A. dawn
B. distance
C. effective permeability
D. square

Answer: distance