By using the given specific facts,
G is on 7th floor. 3 persons live between D and A.
A doesn't live on an even numbered floor, D doesn't live on the ground floor.
This satisfies only when A lives on the ground floor.
E lives between B and C such that B and C live immediately above and immediately below E respectively. Neither H nor C is an immediate neighbour of D.
So, B is placed below D and H is placed on the topmost floor
Therefore the final arrangement is as follows.
While arranging in alphabetical order, the positions of 3 persons excluding A remain unchanged. Hence option 3 is correct.
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