Explanation:

Let’s break it down stepwise:

- D is sixth to the left of B and eighth from the extreme left. That means D is at position 8, and B is at position 14.

- Two people stand between A and B. So, A can be in position 11 or 17. Let’s keep that in mind.

- C is fourth to the left of D. So, position of C = 8?–?4 = 4.

- There are five people between C (4) and E. E can be at 10 (to the right) or at -2 (which is off the row), so E is at 10.

- F stands immediately left to E, so F is at 9.

- Number of people between F (9) and D (8) is 0.

- The same number (0) should be between E (10) and G, so G is at 11.

- H stands seventh to the right of G (11), H is at 18. Also, H is third from one of the extreme ends—so the row length is 20 in all.

- Now, remember A must have two between itself and B (A:11, B:14), so A is at 11.

- So, the row's setup from 1 to 20:

- D: 8

- C: 4

- E: 10

- F: 9

- G: 11

- A: 11

- B: 14

- H: 18

Let’s answer: Who is third to the left of A (A is at 11)? Positions: 10, 9, 8. That’s F, then D. Third to the left is D.

So,

Option 5, D

- Option 1 is B. B is actually to the right of A, not to the left.

- Option 2 is E, but E is immediately to the left of A, not third.

- Option 3 is H, who’s at position 18, far from A.

- Option 4 is C, but C is at position 4.

- Option 5, D, is correct.

What this really means is: position mapping is the key. Count lefts and rights carefully!