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

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

A. frequency
B. thermosphere
C. gpp
D. wind energy

Answer: frequency