Correct Answer: DIMQZ

Solution : Given:
BC_FGH_KL_NP_RSUVWX_

To fill the series we have to divide the series – BC_F / GH_K / L_NP / _RSU / VWX_

Let's check each option –
First option: DIMQZ; BC D F / GH I K / L M NP / Q RSU / VWX Z (Write the English alphabetical series but skip the letter A and every fifth letter after A in the given series )
Second option: EJOQY; BC E F / GH J K / L O NP / Q RSU / VWX Y (No repeated pattern has been found)
Third option: EJMQZ; BC E F / GH J K / L M NP / Q RSU / VWX Z (No repeated pattern has been found)
Fourth option: DJOQY; BC D F / GH J K / L O NP / Q RSU / VWX Y (No repeated pattern has been found)

So, the series becomes→BCDFGHIKLMNPQRSUVWXZ. Hence, the first option is correct.