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

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

A. neritic zone
B. hadal
C. relative humidity
D. wavelength

Answer: wavelength