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

The property 'has volume' applies to instances of 'geometrical object 3d', and 'layer' is a subclass of 'geometrical object 3d'. Which class can appear as the value of 'has volume' for instances of 'layer'?

A. interpolation
B. physical quantity
C. volume
D. Mawsonite

Answer: volume