Syllogism — Premises: All hens are cocks. No cock is black. Conclusions: I) All cocks are hens. II) No hen is black.

Introduction / Context:
This mixes a universal inclusion with a universal exclusion. We test each conclusion cautiously for direction and scope.

Given Data / Assumptions:

• Hens ⊆ Cocks.
• Cocks ∩ Black = ∅.

Concept / Approach:
From Hens ⊆ Cocks and no Cock is Black, we infer Hens ∩ Black = ∅, i.e., no hen is black (II). The first conclusion reverses inclusion and is not supported.

Step-by-Step Solution:

Verification / Alternative check:
Model where some cocks are not hens satisfies premises but falsifies I.

Why Other Options Are Wrong:
Any option including I treats converse as valid; it is not.

Common Pitfalls:
Confusing subset with set equality.

Final Answer:
Only conclusion II is valid.