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LB, GO, HG, KL, ? OE

a) GN b) NH c) DL d) OM

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    $\begingroup$ Considering you've given us four options, is this from a textbook/exam paper? If so, you should ideally mention the source in the question. $\endgroup$ – Aryaman Dec 30 '18 at 7:58
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    $\begingroup$ Not just "ideally". We absolutely forbid the posting here of other people's puzzles without suitable acknowledgement. $\endgroup$ – Gareth McCaughan Dec 30 '18 at 16:34
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Here is a reason I think it could be (b) "NH":

The five known entries all together only repeats any letter at most once:
LBGOHGKLOE -> B E GG H K LL OO

Adding (a), (c), or (d) would each add an already repeated letter:
(a) +GN -> GGG
(c) +DL -> LLL
(d) +OM -> OOO

...while adding (b) doesn't:
LBGOHGKLNHOE -> B E GG HH K LL N OO

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