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

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

A. Characteristic Qualifier
B. Measurement
C. Standard
D. Unit Conversion

Answer: Characteristic Qualifier