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

A Q _ _ S A _ W E _ A _ _ E S _ Q W _ S

Given: A Q _ _ S A _ W E _ A _ _ E S _ Q W _ S

To fill the series, we have to divide the series - A Q _ _ S / A _ W E _ / A _ _ E S / _ Q W _ S

Let's check each option:

First option: WESQWAWE; A Q WE S / A S W E Q / A WA E S / W Q W U S (No repetitive pattern is followed)

Second option: WEQSQWAE; ​A Q WE S / A Q W E S / A QW E S / A Q W E S (AQWES is repeated)

Third option: WEQSQAWE; ​A Q WE S / A Q W E S / A QA E S / W Q W E S (No repetitive pattern is followed)

Fourth option: WSQSQAWE; A Q WS S / A Q W E S / A QA E S / W Q W E S (No repetitive pattern is followed)

Thus, only the second option follows a pattern.

So, the correct answer is (b).