Correct Answer: BJVX

Solution : Given:
_TCUBH_VB_QWBJX_

To fill the series we have to divide the series – _TCU \ BH_V \ B_QW \ BJX_
Let's check each option –
First option: BOJY; B TCU / BH O V / B J QW / BJX Y (No pattern has been found. )
Second option: VJBX; V TCU / BH J V / B B QW / BJX X (No pattern has been found.)
Third option: ADCB; A TCU / BH D V / B C QW / BJX B (No pattern has been found.)
Fourth option: BJVX; B TCU / BH J V / B V QW / BJX X (The first letter remains the same, add 14 to the place value of the second letter, add 7 to the place value of the third letter, and add 1 to the place value of the fourth letter in the series.)
Second letter of the series→T + 14 = H; H + 14 = V; V + 14 = J
Third letter of the series→C + 7 = J; J + 7 = Q; Q + 7 = X
Fourth letter of the series→U + 1 = V; V + 1 = W; W + 1 = X

So, the series becomes BTCUBHJVBVQWBJXX. Hence, the fourth option is correct.