Explanation:

Let's break down the statements:

- Seven boys (B1 to B7) are sitting in a circle, all facing the center.

- B1 is third to the left of B7 (so, there are two people between B7 and B1 in the left direction).

- B4 is immediately to the left of B1.

- B2 is second to the left of B6.

- B6 is not immediately next to B5.

Let's tentatively arrange:

1. Place B7, count three seats to the left (since they all face the center, "left" is clockwise), that position is B1.

2. B4 is immediately to B1's left (again, clockwise from B1).

3. B2 is second to the left (so, two seats clockwise) of B6.

4. B6 cannot sit immediately beside B5.

Testing the arrangement, the immediate neighbours of B3 end up being B4 and B6.

So, reviewing your answer:

Option 4: B4 and B6

Summary in short points:

- Statements analyzed and a circle drawn, seating order matched.

- Checked other options—they don't fit the arrangement.

- Immediate neighbours of B3 are B4 and B6.

- Correct Answer: Option 4 – B4 and B6.