A certain number of people are sitting in a row, facing north. N is sitting third to the left of P.M is sitting third to the left of N. O is sitting third to the left of M. M is sitting between O and N. N is sitting between M and P. If no other person is sitting in the row, what is the total number of persons seated?

Correct option is B

Step-by-Step Analysis:
Step 1: Place the persons based on the information.
N is sitting third to the left of P:
This means the arrangement should be:
_,_,N,_,_,P
M is sitting third to the left of N:
Since N is already placed, M will be positioned as:
_,M, _, _,N,_,_,P
O is sitting third to the left of M:
Given M’s position, O will be placed as:
O,_,_,M, _, _,N,_,_,P
Step 2: Verify the conditions about M and N's positions.
M is sitting between O and N:
This condition is already satisfied in the current arrangement:
N is sitting between M and P:
This condition is also satisfied in the current arrangement.
Step 3: Count the total number of people.
The correct sequence is:O,_,_,M,, _, _,N,_,_,P
Here, the total number of people is 10.
Alternative method:

Total 10 person is sitting in the row.