Directions (87-91) : Study the following information carefully and answer the questions given below.

Twelve persons sit on twelve seats arranged in a row but only some persons are known and all of them are facing towards the north direction. Y is the only neighbour of S. Three persons sit between S and O who sits immediately left of K. More than three persons sit between K and H. K sits 2nd to the left of P who sits exactly between K and U. The number of persons sit between P and B is multiple of 2. The prime number of persons sits between H and B.

Who among the following persons sits 3rd to the right of B?

The correct option is K.

Let us analyze the given information step-by-step to determine the seating arrangement of the 12 persons sitting in a single row facing North.

1. Understanding the row size:
There are exactly 12 seats arranged in a row, numbered from 1 to 12 from left to right.

2. Analyzing the position of Y and S:
"Y is the only neighbour of S."
This implies that S must be sitting at one of the extreme ends of the row (either seat 1 or seat 12), and Y sits right next to S.

Case 1: S is at the extreme left end (Seat 1)
- Position of S = Seat 1
- Position of Y = Seat 2
"Three persons sit between S and O who sits immediately left of K."
- Three persons between S (1) and O means O is at Seat 5.
- Since O is immediately left of K, K is at Seat 6.
"K sits 2nd to the left of P who sits exactly between K and U."
- Since K is at Seat 6, P is at Seat 8.
- P (8) sits exactly between K (6) and U, which means U must be at Seat 10.
"More than three persons sit between K and H."
- K is at Seat 6. To have more than 3 persons between K and H, H could be at Seat 1, 2 (already occupied) or Seat 10, 11, 12. Since U is at 10, H can be at Seat 11 or 12.
"The number of persons sit between P and B is multiple of 2. The prime number of persons sits between H and B."
Let us place the persons on seats 1 to 12:
Seat 1: S
Seat 2: Y
Seat 3: Unknown
Seat 4: Unknown
Seat 5: O
Seat 6: K
Seat 7: Unknown
Seat 8: P
Seat 9: Unknown
Seat 10: U
Seat 11/12: H or B

Let's check positions for B and H:
If B sits at Seat 3 (between P at 8 and B at 3, there are 4 persons, which is a multiple of 2):
If B is at Seat 3:
- If H is at Seat 11, persons between H (11) and B (3) = 11 - 3 - 1 = 7 (which is a prime number!).
- Let's check Seat 12 for H: 12 - 3 - 1 = 8 (not prime).
So, H = Seat 11, B = Seat 3.

Let's check the complete row layout under Case 1:
Seat 1: S
Seat 2: Y
Seat 3: B
Seat 4: Unknown
Seat 5: O
Seat 6: K
Seat 7: Unknown
Seat 8: P
Seat 9: Unknown
Seat 10: U
Seat 11: H
Seat 12: Unknown

3. Answering the Question:
We need to find who among the following persons sits 3rd to the right of B.
- B is at Seat 3.
- 1st to the right of B = Seat 4
- 2nd to the right of B = Seat 5 (O)
- 3rd to the right of B = Seat 6 (K)

Therefore, K sits 3rd to the right of B.