Correct Answer: IBTURLP

Solution : Given:

BRU_TLP_RUI_LPBR_ITLPB_UIT_ _

To fill the series we have to divide the series – BRU_TLP / _RUI_LP / BR_ITLP / B_UIT_ _

Let's check each option –
First option: IBTRUPL; BRU I TLP / B RUI T LP / BR R ITLP / B U UIT PL (No repeated pattern has been found)
Second option: IBTUPLR; BRU I TLP / B RUI T LP / BR U ITLP / B P UIT LR (No repeated pattern has been found)
Third option: IBRUTLP; BRU I TLP / B RUI R LP / BR U ITLP / B T UIT LP (No repeated pattern has been found)
Fourth option: IBTURLP; BRU I TLP / B RUI T LP / BR U ITLP / B R UIT LP (BRUITLP is being repeated)

So, the series becomes→BRUITLPBRUITLPBRUITLPBRUITLP. Hence, the fourth option is correct.