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【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 xRy mean person x is a full brother of person y.
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.
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