Concept:This is a linear arrangement puzzle where we must place seven people facing north, using given constraints.
Explanation:Let us arrange the positions from left to right (positions 1 to 7).
"No one sits to the left of D" means D is at the extreme left, position 1.
"Only four people sit between D and C" means C is at position 6 (since D at 1, four people between them gives positions 2,3,4,5, so C = 6).
"Only three people sit to the right of Y" means Y is at position 4 (since three to the right means positions 5,6,7).
"X sits to the immediate left of A" means X and A are a pair, with X left of A.
"W is not an immediate neighbour of Y" – possible positions for W are 2,3,5,6,7 but check adjacency.
Now fill remaining positions: D=1, C=6, Y=4. The pair X-A must be placed in positions 2-3 or 5-6? But 6 is C, so X-A can be 2-3 or 5-6? C at 6 so 5-6 not possible. So X-A goes to 2-3. That gives X=2, A=3. Then remaining positions are 5 and 7 for B and W. W cannot be neighbour of Y (Y at 4), so neighbour positions are 3 and 5. Position 3 is A, so W cannot be at 5. Thus W must be at 7, and B at 5.
Final arrangement (left to right): 1:D, 2:X, 3:A, 4:Y, 5:B, 6:C, 7:W.
We need who sits third to the left of W. W is at 7. Third left means 7-3 = 4, which is Y.
Answer:Y (Option B).
