Four children are sitting in a row. A is occupying the seat next to B but not next to C. If C is not sitting next to D, who is/are occupying seat/seats adjacent to D?

1. Identify the most restricted person: Look at **C**. The problem states C is **not** next to A, and C is **not** next to D.\n2. Apply Exclusion: There are only 4 people (A, B, C, D). If C cannot touch A or D, the *only* person left for C to sit next to is **B**.\n3. Form the first block: So, the arrangement must contain the block **[C-B]**. \n4. Extend the chain: We know A is next to B. Since B is already next to C, and A cannot be next to C, A must be on the other side of B. This creates the chain **[C-B-A]**.\n5. Place the final person: Only **D** is left. D cannot be next to C (which is at the far end), so D must be next to A. \n6. Final Arrangement: The row is **C - B - A - D** (or the reverse order D-A-B-C).\n7. Answer the question: In this arrangement, the person adjacent to D is **A**.