Directions: Study the information carefully and answer the questions given below.
A certain number of persons are sitting in a row facing north. M sits fourth to the left of O and only two persons sit left of M. Only two persons sit between M and Q. R sits second to the left of Q. S sits fourth to the right of O. Not more than five persons sit between P and Q. P sits to the right of S. Eight persons sit between P and G, who sits at one of the extreme ends.

Q:

How many persons sit in the row?

• 1
  18
• 2
  21
• 3
  22
• 4
  23
• 5
  17