Eight girls, A, B, C, D, E, F, G and H, are seated around a square table, facing the centre. A sits 2^nd to the right of B. F sits 2^nd to the right of E, who sits fourth to the left of H. G sits between A and B. D sits to the immediate left of H, who is to the immediate left of B. Only one person sits between C and D. who is fourth to the right of G?

Given:  A sits 2^ndto the right of B.

F sits 2^ndto the right of E, who sits fourth to the left of H.

G sits between A and B.

D sits to the immediate left of H, who is to the immediate left of B.

Only one person sits between C and D. 

So, F is fourth to the right of G.

Thus, Option A is the correct answer.