Task: Property Constraint Reasoning (ontology: Legal/Public_Procurement_Ontology)

The property 'Contract modification' applies to instances of 'Public contract', and 'Derivative contract' is a subclass of 'Public contract'. Which class can appear as the value of 'Contract modification' for instances of 'Derivative contract'?

A. Contract activites
B. Contract economic conditions
C. Contract additional obligations
D. Contract modification

Answer: Contract modification