Propaganda and media.
One of the ways media was used was when media that was more appealing to the younger generation (children) such as comic books, textbooks and schooling was used to spread negative messages and enforce negative opinions of communism in the United States of America.
Education in America was a propaganda tool, using the ideas of democracy and freedom to present the Soviet Union as an enemy who did not agree with their views.
Posters were one of the most obvious examples of propaganda-google it and you'll easily find many different examples as well.
The phrase "E Pluribus Unum" actually means "out of many, one". So the answer choice that best fits that definition would be A! The reason why is because the phrase means that the U.S is composed of many, but that it's united.
The theory which states that when there are multiple possible explanatons of an event or a phenomenon, the simplest is the best would be Occam's razor.
However, it's important to note that this idea actually states that we shouldn't necessarily multiply ontological entities, which doesn't really mean the easiest solution necessarily.
ANSWER:
the presidential election was rigged.
