Once you attempt the question then PrepInsta explanation will be displayed.

As, A sits third to the right of H and third to the left of B

So, the arrangement can be like this

As D sits second to the right of E and E is not the neighbour of B.

So, the is only 1 possible arrangement

As, F is neither a neighbor of E nor of H.

So, there is only 1 possibility

As G sits second to the left of C

So, the final arrangement is

Here H,E and A,F and C,A has 1 person in between them (anti clockwise direction)

And A,B have 2 people in between them (anti clockwise direction).

So, the answer is A,B.