Could There Be a Categorical Proposition That Only Involves One

Could there be a categorical proposition that only involves one class?

A) Yes, but the class would have to have a large number of referents.
B) Yes, but the proposition would have to be affirmative.
C) Yes, but the proposition would have to be negative.
D) No, because categorical propositions must involve at least three classes.
E) No, because categorical propositions simply tell us how two classes differ from each other.