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

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

A. condensation level
B. radiational heating
C. orbital motion
D. frequency

Answer: frequency