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

The property 'has qualifier' applies to instances of 'Measured Characteristic', and 'MassDensity' is a subclass of 'Measured Characteristic'. Which class can appear as the value of 'has qualifier' for instances of 'MassDensity'?

A. Characteristic
B. Measurement Value
C. Characteristic Qualifier
D. Measurement Type

Answer: Characteristic Qualifier