Task: Instance Class Understanding (ontology: Business_Finance/Financial_Industry_Business_Ontology)

Which of the following classes does 'Bond Markets Unit European Monetary Unit (E.M.U.-6)' belong to as one valid explicit type? Context: the Bond Markets Unit European Monetary Unit (E.M.U.-6)

A. base unit
B. index
C. interval scale
D. unit of account

Answer: unit of account