q - p q q r - q q r p - q r p q q - p q

A) r p q r
B) p q r p

C) r p r q
D) r q q r

Correct answer:
A) r p q r

Description for Correct answer:
The series is q r p q / q r p q / q r p q / q r p q / q r p q

Please provide the error details in above question

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