Can the Rules of Validity Be Applied to Syllogisms That

Multiple Choice

Can the rules of validity be applied to syllogisms that contain singular categorical propositions?

A) No, since singular propositions lack a proper quantity.
B) No, since singular propositions do not have a concept as the subject.
C) No, since it would be impossible to assign a mood to such a syllogism.
D) Yes, since singular propositions can be treated like universal propositions.
E) Yes, since the rules can be applied to any syllogism of any kind.