Select the correct option that when filled in the blanks in the same sequence will make the series logically complete.
TRIC_TRI_KT_IWK_R_TK

The correct option is KZRTI.

Let's analyze the given series by dividing it into four groups of 5 letters each:

Group 1: T R I C _

Group 2: T R I _ K

Group 3: T _ I W K

Group 4: _ R _ T K

If we substitute the letters from the option KZRTI into the blanks in sequence:

Blank 1 = K

Blank 2 = Z

Blank 3 = R

Blank 4 = T

Blank 5 = I

The four groups become:

Group 1: T R I C K

Group 2: T R I Z K

Group 3: T R I W K

Group 4: T R I T K

Pattern:

1. The 1st, 2nd, 3rd, and 5th letters of each group remain constant as T, R, I, and K respectively.

2. The 4th letter of each group follows a reverse alphabetical sequence decreasing by 3 positions each step:

C (3) - 3 = Z (26)

Z (26) - 3 = W (23)

W (23) - 3 = T (20)

Therefore, the sequence of missing letters is KZRTI.