Correct Answer: CBCAC

Solution : Given:
ABC_A_CCAB_C_B_C

To fill the series we have to divide the series – ABC_ / A_CC / AB_C / _B_C

Let's check each option –
First option : ABBCC; ABC A / A B CC / AB B C / C B C C (No repeated pattern has been found)
Second option: CABBA; ABC C / A A CC / AB B C / B B A C (No repeated pattern has been found)
Third option: CBCAC; ABC C / A B CC / AB C C / A B C C (ABCC is repeated in the series)
Fourth option: ACCBA; ABC A / A C CC / AB C C / B B A C (No repeated pattern has been found)

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