Correct Answer: ababc

Solution : Given:
a_b_cc_a_b_c

To fill in the blanks, divide the series into letter clusters – a_ b_ cc / _a _b _c
Let's check each option –
First option: ababc; a a b b cc / a a b b c c (aabbcc is repeated in the series.)
Second option: aacbb; a a b a cc / c a b b b c (No repeated pattern found.)
Third option: abcab; a a b b cc / c a a b b c (No repeated pattern found.)
Fourth option: abbcc; a a b b cc / b a c b c c (No repeated pattern found.)

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