Answer:
Option D
Explanation:
B is to the immediate right of E i.e. E, B.
C is between A and E i.e. A, C, E, B.
Since D is not at the end and F is not at the right end, so the sequence in the row becomes: F,D,A,C,E,B.
There are four persons to the right of D - A, C, E, B.