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

The property 'has trading date time' applies to instances of 'security price', and 'clean price' is a subclass of 'security price'. Which class can appear as the value of 'has trading date time' for instances of 'clean price'?

A. date time
B. collection of security prices
C. yield spread
D. rate of return

Answer: date time