Select the option that represents the letters which when sequentially placed from left to right in the blanks below will complete the letter series.

T R _ _ Q T _ E W _ T _ _ W Q _ R G _ Q

D W R Q R F T W

T R _ _ Q T _ E W _ T _ _ W Q _ R G _ Q

The logic followed here is :

T R D W Q / T R E W Q / T R F W Q / T R G W Q

D W R Q R F T W

In this the third letter keeps increasing by 1