Three statements are given followed by four conclusions. You have to consider the statements to be true even if they seem to be at variance from commonly known facts. You are to decide which of the given conclusions if any, follow from the given statements.

Statements
All dogs are rats.
All rats are crows.
All crows are parrots.

Conclusions
I. All dogs are parrots.
II. Some parrots are dogs.
III. Some crows.are dogs.
IV. All rats are dogs.

Only conclusions I and II follow

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Only conclusions I, II and III follow

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Either conclusion III or IV follows

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Either conclusion I or II or III follows

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None of the above

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Solution

The correct option is B Only conclusions I, II and III follow
All the three premises are universal affirmative (A-type).
All dogs are rats.
All rats are crows.
$A + A \Rightarrow A$ -type of conclusion
All dogs are crows.
Conclusion III is the converse of it.
All rats are crows.
All crows are parrots.
$A + A \Rightarrow A$ -type of conclusion
All rats are parrots.
All dogs are crows.
All crows are parrots.
$A + A \Rightarrow A$ -type of conclusion
All dogs are parrots.
This is conclusion I.
Conclusion II is the converse of it.

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