Task: Property Constraint Reasoning (ontology: Business_Finance/Financial_Industry_Business_Ontology)

The property 'has rate of return' applies to instances of 'financial instrument', and 'spot contract' is a subclass of 'financial instrument'. Which class can appear as the value of 'has rate of return' for instances of 'spot contract'?

A. mid price
B. rate of return
C. high price
D. market price

Answer: rate of return