Select the set of letters that when sequentially placed in the blanks of the given letter series will complete the series.
p_rsqrps_pqs_qr_qrps_p_s
Answer & explanation
Correct answer: option 1
p q r s / q r p s / r p q s / p q r s / q r p s / r p q s
q , r , p , s , r , q