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 _ _ W a L W _ L _ W a L _ a _a W _ L

W L a a a W L a

After dividing it into groups and comparing the corresponding term we, get "W L a a a W L a" as the repetitive term because it follows the pattern.

W a La W a L W a L a W a L W a L a W a L