Correct option is A
Given:
- Seven persons A, B, C, D, E, F and G are sitting in a row facing each north.
- Only one person sits to the left of G.
- Only 2 persons sit between G and D.
- E sits to the immediate right of B.
- C sits to the immediate left of F.
- Only one person sits between D and B.
According to given information;

So, only 1 persons sit between A and B.
Thus, the correct answer is (a).