Correct Answer - Option 4 : X

1. X is elder than Z.

X > Z

2. Y is younger than Z.

Z > Y

3.Z is elder than W.

Z > W

4. W is younger than X.

X > W

From all the statements, we get two possible cases:

Case I: X > Z > Y > W

Case II: X > Z > W > Y

From both the cases, it is clear that 'X' is the eldest.

Hence, ‘**X**’ is the correct answer.