【单选题】The relation 'is preferred to' between commodity bundles is just one example of a binary relation. Another example is the relation 'is a full brother of ' defined over the set of all human beings. Let...
A.
The relation R is reflexive, transitive, and complete.
B.
The relation R is transitive and complete but not reflexive.
C.
The relation R is transitive but not complete or reflexive
D.
The relation R is complete but not transitive or reflexive.