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

The property 'has target unit' applies to instances of 'Unit Conversion', and 'FootToMeter' is a subclass of 'Unit Conversion'. Which class can appear as the value of 'has target unit' for instances of 'FootToMeter'?

A. Measurement Type
B. Measured Characteristic
C. Index
D. Unit

Answer: Unit