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

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

A. oikocryst
B. dune
C. outwash fan
D. wavelength

Answer: wavelength