I think it’s a. the use of bolding, font size, and headlines
The answer is D. A verb that starts with "to" is in an infinitive verb form. It should be noted that a verb in this form does not function as a verb instead it functions as another part of speech. Infinitives can function as adverbs, adjectives or as nouns.
The correct answers are:
5.) I
6.) Them
7.) Them
8.) Its
9.) All
10.) Who
These have been edited, they are now correct.
The best answer here is A. If we refer to the text itself, we can see why. As the story progresses, the pigs start to think of themselves as superior to the other animals for one reason or another. In fact, they start to take on many of the characteristics of the humans they earlier touted as being evil and the reason for all their problems.
While the other animals might not have totally believed them, they went along with it because the society itself was equal. Each animal had its job to keep things running. However, because the pigs think themselves superior, they decide they should be the ones to rule and stop working. They also come up with a variety of rules that are supposed to exert their superiority over the other animals. However, at this point, there isn't much the other animals can do except grin and bear it and hope that it gets better.