D) FIL | Explanation:There are two series BEH, DGJ, FIL and EJO, GLQ, INS. The first letter in every group of the series comes after a gap of one letter, i.e., B, D, F, and the second and third letters of each group have the same sequence, i.e., EGI and HJL. Same is the case with the second series.

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