Six in a row: A and B are at the two ends; E and F occupy the two center seats; C sits immediately to the left of A. Who sits immediately to the right of B?

Introduction / Context:
The row has six seats. The ends are fixed by A and B, the centers by E and F, and one immediate-neighbor condition determines the remaining positions. We must identify who is to the immediate right of B.

Given Data / Assumptions:

• A and B are at the ends (positions 1 and 6 in some order).
• E and F are at positions 3 and 4 (centers).
• C sits immediately to the left of A.

Concept / Approach:
If A were at the left end, “immediately to the left of A” would be impossible. Hence A must be at the right end (position 6) with C at position 5. Then B is at position 1; E/F fill positions 3/4; the remaining seat (position 2) is D.

Step-by-Step Solution:
Positions: 1=B, 2=D, 3/4=E/F in any order, 5=C, 6=A.“Immediately right of B” (from the viewer’s left→right) is position 2, which is D.

Verification / Alternative check:
Swapping E and F does not change who sits at position 2.

Why Other Options Are Wrong:
A/E/F are at positions 6/3–4/3–4; none is immediately to the right of B at position 1.

Common Pitfalls:
Reading “left of A” as non-immediate; the immediate condition is necessary to make the solution unique.

Final Answer:
D