Select the set of letters that when sequentially placed in the blanks ofthe givenletter series will complete the series.
P_rsqrps_pqs_qr_qrps_p_s

A

q,r,p,s,r,q

B

q,r,p,p,r,q

C

p,r,p,s,r,p

D

r,p,q,s,r,q