In the series _b_a_ba_b_abab_aab; fill in the six blanks ( _ ) using one of the following given four choices such that the series follows a specific order.

Correct Option: (d) ababab

Let's analyze the given series with blanks: _ b _ a _ b a _ b _ a b a b _ a a b. Total characters including blanks: let's look at the repeating pattern. Let's test option (d) 'ababab': Substituting 'ababab' into the blanks: a b b a a b a b a b a b a b a a a b? Wait, let's test choice (d): ababab -> 1st blank: a, 2nd: b, 3rd: a, 4th: b, 5th: a, 6th: b. Let's place them: a b b a a b a b b a b a b a b. Let's check the repeating block: 'abba', 'abab', etc. Let's test choice (d) properly: _b_a_ba_b_abab_aab with ababab -> a b b a a b a b a b a b a a b. Let's check pattern length: length of series is 18. Let's test repeating unit 'abbaab' or similar. If we fill with 'ababab': a b b a a b a b a b a b a a b -> wait, let's test option (d): a b a b a b. Filling blanks: a b (a) b (b) a (a) b a (b) b a b a b (a) a b -> wait, let's check option (d) letters: a, b, a, b, a, b. Let's place them into _b_a_ba_b_abab_aab: 1st: a -> abba... wait. Let's look at standard solution for this recurring series: The pattern is 'abbaab' repeated or 'a b b a a b'. Filling with option (d) 'ababab' gives the exact repeating sequence 'a b b a a b / a b b a a b / a b b a a b'. Thus, option (d) is correct.