Six people M, N, O, P, Q and R are sitting in a straight row, facing north. O is sitting to the immediate right of N. P is sitting to the immediate right of O. Q is sitting to the immediate right of P. R is sitting to the immediate left of N. If there are only five people sitting to the right of M, who is at the extreme right end of the row?

A

N

B

R

C

P

D

Q