8 boys A, B, C, D, E, F, G and H are sitting around a square table facing towards the centre (not necessarily in the same order). 4 boys are sitting at each corner, and 4 boys are sitting at the middle of each side of the table. A is an immediate neighbour of H and G. A is sitting at a corner. B is an immediate neighbour of D and C. E is an immediate neighbour of C and F. G is third to the right of D. 

Three out of the following four options follow a similar rule and form a group. Which of the following does NOT belong to that group?

GC

Answer: GC

In this question you need to first place A at a corner and then place G to it's right, and then place D and H and then place B