Argument - a reason or set of reasons given with the aim of persuading others that an action or idea is right or wrong.
Considering the purpose of most propaganda, C) should be most wary of in this footage i.e; the bias present in propaganda materials.
The word "either" is a correlative. The answer is D. This is because a correlative conjunction connects two nouns and ideas that relates to each other. Either uses "or" so it connects two choices in one situation.
If you think about theme and understand what it is then you read the paragraph or sentence that you are reading then you will know exactly the theme of the story.
