Explanation:

Let’s break down the clues step by step:

- There are seven seats: _ _ _ _ _ _ _

- B sits at the extreme right end: _ _ _ _ _ _ B

- G sits second to the left of B: So, G is at position B-2: _ _ _ _ G _ B

- E sits exactly between G and B: So, E must be between G and B: _ _ _ _ G E B

- Only two persons sit between F and G: So, F must be two spots left of G, or two spots to the left.

- Let's try two left: F _ _ G E _ B

- D sits third to the left of C. So, if we call C as the furthest right possible, but since B is at the very end, try to fit:

- A sits second to the right of D.

- After filling possibilities, the only arrangement possible is:

1. F 2. D 3. A 4. C 5. G 6. E 7. B

So, the seat order is: F D A C G E B

- The middle seat (seat 4) is C.

- Option 1: C

- Option 2: D

- Option 3: E

- Option 4: F

- Option 5: G