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

_ T Z S S T _ Y S S T T _ S S _ T W _ S

T T X T S

After dividing it into groups  and comparing the corresponding term we, get "T T X T S" as the repetitive term because it follows the pattern.

T T Z S S T T Y S S T T X S S T T W S S