Correct option is C
F is at extreme right.
C is 7th to the left of F.
So counting from right:
F = position last
C = 7th to left of F
C has 3 persons on the left.
So total persons:
3 (left of C)
1 (C)
7 (between C and F including F position shift)
Total = 3 + 1 + 7 = 11
Answer: (C) 11