_ z _ x x z z _ _ x x _ _ z z
Explanation:
The best approach is to substitute options and check for the pattern.
Option (a): x z z x x z z x x x x x z z z,
No pattern emerges here.
Option (b): x z x x x z z z z x x x x z z,
Option (c): x z z x x z z x z x x x z z z,
Option (d): x z z x x z z z x x x z z z z,
Here the pattern is x z z / x x z z z / x x x z z z z / …
Hence, option (d).
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