Explanation:

- Initially, focus on the relationship between A and B: There are four persons between A and B.

- C is fourth to the right of B, and D is third to the right of A.

- E is to the immediate left of G, and G is third from the extreme end.

- G is fourth to the right of D, and E is fifth to the right of F.

- B is sixth to the right of H, and H is not immediately next to A.

- There are as many persons between C and F as between F and D.

- H is two seats left of I, who is fourth from the extreme end.

With these relations resolved, we find 22 seats are needed to satisfy all the conditions given, so:

Correct Answer: 22 Option: 4

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