Answer:
B. A <u>couple</u> of groups of people are treated much better than the rest.
Explanation:
A. There is an unfair <u><em>hierarchy</em></u> to how people are treated in this world.
B. A <u>couple</u> of groups of people are treated much better than the rest.
C. Though it is not fair, that <u>hierarchy</u> is the way of the world.
D. However, many people are working to <u>couple</u> (change in; place of couple) those ways, so they are fairer.
As used in the sentence, "A couple of categories of people are treated significantly better than the others." Since the word "couple" can mean either two people or two things, the most precise wording would be "certain groups of humans are treated significantly better than others." This misspelling has a profound impact on the phrase's intended meaning.