Select the option that represents the letters that, when sequentially placed from left to right in the following blanks, will complete the letter-series.
R _ G _ D _ T G _ D R _ G F _ R T _ _ D
1
TFTFTDGF
2
TFRTTDGF
3
TFRFTDGF
4
TFRFTDFG
Select the option that represents the letters that, when sequentially placed from left to right in the following blanks, will complete the letter-series.
R _ G _ D _ T G _ D R _ G F _ R T _ _ D