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