Correct Answer: JOJKPHOQKP

Solution : Given:
_HK_PQ_H_O_QJ_K_P_JH_O_Q

To fill the series, we have to divide the series – _HK_PQ / _H_O_Q / J_K_P_ / JH_O_Q
Let's check the given options –
First option: OJKJPHOQPK; O HK J PQ / K H J O P Q / J H K O P Q / JH P O K Q (No repeated pattern found.)
Second option: JOKJPHQOKP; J HK O PQ / K H J O P Q / J H K Q P O / JH K O P Q (No repeated pattern found.)
Third option: JOJKPHOQKP; J HK O PQ / J H K O P Q / J H K O P Q / JH K O P Q (JHKOPQ is repeated in the series.)
Fourth option: OJJKPHQOKP; O HK J PQ / J H K O P Q / J H K Q P O / JH K O P Q (No repeated pattern found.)

So, the series becomes→JHKOPQJHKOPQJHKOPQJHKOPQ. Hence, the third option is correct.