Answer: (iii) 11231

Reasoning (shift–reduce with actions executed on reduce)

Grammar:
$$S \to xxW \ \{\text{print }1\}, \qquad S \to y \ \{\text{print }2\}, \qquad S \to Sz \ \{\text{print }3\}$$

Input string: x x x x y z z.

Reducing the string from the input up to $S$ (the actions fire in the order the reductions are performed):

Step	Stack contents (top right)	Action	Printed
1	x x collected, W → … y	reduce xxW → S	1
2	next x x + …	reduce xxW → S	1
3	y	reduce y → S	2
4	S + z	reduce Sz → S	3
5	S + z then top combine	reduce (top-level xxW/final)	1

Collecting the prints in the order the reductions happen:

$$\boxed{11231}$$

Hence the correct choice is (iii).