B.
From (3) to (4), implication.
(4) is I, particular proposition. Subject class is empty.
Invalid.
C.
From (2) to (3), implication.
(4) is O, particular proposition. Subject class is empty.
Invalid.
D.
Both (1) and (2) could be true, because unicorn is empty. If … then. Both could be true.
(3) is particular proposition. Subject class is empty.
Invalid.
E.
(2) is particular proposition. Subject class is empty.
Invalid.
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