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

A

p, p, l, b, r, q, b

B

p, b, l, r, q, p, b

C

l, p, q, b, r, p, b

D

p, l, b, q, r, b, p