Select the option that represents the letters that, when placed from left to right in the same sequence in the blanks below, will complete the letter series.
G_Q_A_T_N_GTQN_G_QND

Correct option is A

Given: G_Q_A_T_N_GTQN_G_QND
Option (A): TNGQBCT
the series becomes: GTQNA/GTQNB/GTQNC/GTQND
There is identifiable or logical pattern in the letters. Option A fits.
Option (B): TAGNBCT
the series becomes: GTQAAGTNNBGTQNCGTQND
Again, this does not establish a consistent pattern. Option B does not fit.
Option (C): TGGQBCQ
the series becomes: GTQGAGTQNBGTQNCGQQND
This sequence maintains no consistent logic. Option C does not fit.
Option (D): TNGQBQC
the series becomes: GTQNAGTQNBGTQNQGCQND
Thus, correct option is (a).