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

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

A. Contract modification
B. Contract economic conditions
C. Contract object
D. Contract procedure

Answer: Contract modification