Statement I:
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“H’s flat, which is adjacent to M, is exactly below K’s flat, which is on the fifth floor.”
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K is on the 5th floor.
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H is exactly below K ⇒ H is on the 4th floor.
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H is adjacent to M ⇒ M must be on a floor immediately next to H’s floor (i.e., either 3rd or 5th).
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But floor 5 is already taken by K, so M cannot be on 5.
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Hence M must be on the 3rd floor.
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So Statement I alone pins M down to floor 3. It is sufficient.
Statement II:
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“M’s flat is exactly above G’s flat, whose flat is exactly above N’s first-floor flat.”
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N is on the 1st floor.
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G is exactly above N ⇒ G is on the 2nd floor.
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M is exactly above G ⇒ M is on the 3rd floor.
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So Statement II alone also shows M is on floor 3. It is sufficient.
Because either statement by itself suffices to place M on the 3rd floor, the correct choice is:
(c) If the data either in statement I alone or in statement II alone are sufficient to answer the question.
