Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.NEURO_ CNEUR ICNEU TICNE _OTIC

Let's count the total letters and look for repeating root words. The phrase contains recurring elements related to "NEUROTIC".Let's divide the pattern into sections of equal lengths or growing structures:NEUROTICNEUROTICNEUROTICNEUROTICLet's fit the options into the blanks:NEURO [ T ] [ I ] C $\to$ NEUROTICNEUR [ O ] [ T ] IC $\to$ NEUROTICNEU [ R ] [ O ] TIC $\to$ NEUROTICNE [ U ] [ R ] OTIC $\to$ NEUROTICThe sequential letters inserted into the blanks are:T, I, O, T, R, O, U, RThus, the correct combination is TIOTROUR.