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

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

A. temperate forest
B. warm conveyor belt
C. wavelength
D. glacial plain

Answer: wavelength