Which one set of letters when sequentially placed at the gap in the given letter series shall complete it. jl_nok_lm_okj_mn_ _

mjklok  ljnlok  mjnloo  mjnlok

mjnlok

Here series is :- jl(m)nok / (j)lm(n)ok / j(l)mn(o)(k) So answer is :- mjnlok