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

The property 'has milestone provision' applies to instances of 'agreement', and 'contract' is a subclass of 'agreement'. Which class can appear as the value of 'has milestone provision' for instances of 'contract'?

A. contract milestone
B. mutual contractual agreement
C. written contract
D. contractual commitment

Answer: contract milestone