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

The property 'is linked to fallback' applies to instances of 'financial instrument', and 'currency instrument' is a subclass of 'financial instrument'. Which class can appear as the value of 'is linked to fallback' for instances of 'currency instrument'?

A. unsecured bond
B. U.K. Government security
C. government bond
D. certificate of obligation

Answer: government bond