Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.
p r _ b n _ r q _ n p _ q b _ p _ q _ n

A

q, p, b, r, r, n, n

B

q, b, p, n, r, n, r

C

q, r, n, p, b, r, n

D

q, p, b, r, n, r, b