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

The property 'has quotation block amount basis' applies to instances of 'quoted exchange rate', and 'currency forward rate' is a subclass of 'quoted exchange rate'. Which class can appear as the value of 'has quotation block amount basis' for instances of 'currency forward rate'?

A. currency forward rate volatility
B. monetary amount
C. currency spot buy rate
D. exchange rate structure

Answer: monetary amount