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.