Which of the following groups of letters when sequentially placed from left to right will complete the given series?
defgh_defghidefg_idefghidef_hidefghide_ghi

Correct option is C

Given: defgh_defghidefg_idefghidef_hidefghide_ghi
From option (a) ihhf
defgh idefghidefg hidefghidef hhidefghide fghi (sequence not followed)
From option (b) ehgf
defgh edefghidefg hidefghidef ghidefghide fgh (sequence not followed)
From option (c) ihgf
defgh i/defghi/defg hi/defghi/def ghi/defghi/de fghi (sequence followed)
From option (d) defg
defgh ddefghidefg eidefghidef fhidefghide ggh (sequence not followed)
Correct answer is (c).