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

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

A. distance
B. amoebae
C. magnetosphere
D. binary property

Answer: distance