Correct Answer: E W T G R Q W

Solution : Given:
Q W _ R T Q _ F R _ Q W _ _ T _ _ H R T

To fill the series we have to divide the series – Q W _ R T / Q _ F R _ / Q W _ _ T / _ _ H R T

Let's check each option –
First option: F W T G R Q X; Q W F R T / Q W F R T / Q W G R T / Q X H R T (No repeated pattern has been found.)
Second option: E X T G R Q X; Q W E R T / Q X F R T / Q W G R T / Q X H R T (No repeated pattern has been found.)
Third option: E W T G R Q W; Q W E R T / Q W F R T / Q W G R T / Q W H R T (QWRT is repeated and add 1 to the place value of the third letter to get the third letter of the next part.)
Fourth option: E W T H S Q W; Q W E R T / Q W F R T / Q W H S T / Q W H R T (No repeated pattern has been found.)

So, the series becomes→Q W E R T Q W F R T Q W G R T Q W H R T. Hence, the third option is correct.