Once you attempt the question then PrepInsta explanation will be displayed.
The given statements can be represented in the following basic diagram.
Conclusion I, negative, follows.
Conclusion II, affirmative, does not follow.
Conclusion III, affirmative, does not follow.
Conclusion IV, affirmative, does not follow.
As negative conclusion follows, let us try to negate through an alternate diagram.
The negation of conclusion I is \"Some rankers are smart\".
Conclusion I is negated, hence I does not follow, but conclusion IV which did not
follow earlier follows now.
Either I or IV follows.
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