问题：
[单选题]Which of the description of the concept class diagram is incorrect?
AConcept class has no behavior
BConceptual class diagrams must be defined based on system requirements
CIf the candidate class does not need to maintain state only behavior, and there is no other associated state with it, we can eliminate this candidate class
DThe basic elements of the conceptual class diagram are objects, classes, links, associations (aggregation), inheritance
