Answer:
Option C
Explanation:
D is immediately behind A i.e A, D.
D and C are fourth and fifth respectively ie _,_, A, D, C, _, _'.
There is exactly one person between C and G i.e _, _, A, D, C, _, G.
F is behind B, D and E.So, F is between Q and G while the first two positions are taken by B and E.
Thus, the sequence becomes B/E, B/E, A, D, C, F, G. Clearly, F is sixth in the line.