Correct Answer: TRFURUUFUR

Solution : Given:
FU_U_E_UT_ _EF_T_RE_ _TU_E

To fill the series, we have to divide the series – FU_U_E / _UT_ _E / F_T_RE / _ _TU_E
Let's check the given options –
First option: TRFURUUFUR; FU T U R E / F UT UR E / F U T U RE / FU TU R E
(FUTURE is repeated in the series.)
Second option: FUFRUUFTRF; FU F U U E / F UT RU E / F U T F RE / TR TU F E (No repeated pattern found.)
Third option: TRFUFRUTUF; FU T U R E / F UT UF E / F R T U RE / TU TU F E (No repeated pattern found.)
Fourth option: FUFRUTFRRF; FU F U U E / F UT RU E / F T T F RE / RR TU F E (No repeated pattern found.)

So, the sequence is FUTUREFUTUREFUTUREFUTURE. Hence, the first option is correct.