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

A

e, p, r, e, l, r, x, q

B

p, e, r, p, l, r, x, q

C

e, x, q, r, p, l, x, p

D

p, e, q, l, x, p, r, q