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

A) p p r r

B) p q p r

C) q p r p

D) p p q r

Correct answer:
B) p q p r

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


Please provide the error details in above question