Explanation:

Let’s break it down, step by step:

- There are two rows. Six face north (A, B, C, D, E, F), six face south (P, Q, R, S, T, U).

- “A and R sit diagonally opposite each other. A sits at an extreme end.” So, A is at one end—let’s put A at the leftmost, row 1.

- “Two persons between R and Q.” So, R and Q have exactly two people sitting between them.

- “One of Q’s immediate neighbors faces C. C is not near A.”

- “P faces B. P is not next to Q.”

- “Two persons between B and D.”

- “E does not sit at any extreme end.”

- “T is second to the right of U. S and T are not neighbors."

Now, about R and U:

Working out the arrangement (to focus on R and U):

Let’s map out the possibilities. For simplicity, using:

Row 1 (North, left to right): A, _, _, _, _, _

Row 2 (South, left to right): _, _, _, _, _, _

- A at leftmost (1st). R diagonally opposite, so R at 6th in row 2.

- “Two between R and Q” — so Q is at 3rd or 6th; try Q at 3rd in row 2.

- T is second to the right of U. So, if U at 2nd, T at 4th.

- S and T aren't neighbors, so S isn’t at 3rd or 5th.

- E isn’t at ends (can’t be 1st or 6th row 1).

With these statements, you get this kind of placement:

Row 1 (North): A _ _ _ _ _

Row 2 (South): _ U Q T _ R

Now, check—how many people sit between R (6th) and U (2nd) in row 2?

It’s clearly Three: seats 3, 4, and 5 fall between seat 2 (U) and seat 6 (R).

So the correct answer is:

Option: 3 – Three

What this really means is, people sometimes overthink grids, but if you piece together each clue and use process of elimination, you can work these puzzles out easily. The answer is three people between R and U.