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

The property 'has wavelength' applies to instances of 'wave', and 'traveling wave' is a subclass of 'wave'. Which class can appear as the value of 'has wavelength' for instances of 'traveling wave'?

A. wavelength
B. cyclotron radius
C. atmospheric boundary layer
D. skin layer

Answer: wavelength