Explain the subject verb agreement rule that applies to a singular collective subject functioning as a single unit

in this passage from chapter 6 of "animal farm", by george orwell, what the author is ridiculing in this passage is the frivolity of some rules.

clover, the mare, believes she remembers that the fourth commandment forbade sleeping in beds because it was something that humans did. snowball, napoleon, and the pigs are brain-workers who look after the welfare of the farm. they are the obvious leaders because they are smart, and so they are entitled to eat the best food and sleep in beds. it is squealer, who says these lines making the difference between sleeping with sheets, what humans do, and sleeping in beds, what pigs do. the unwillingness to question authority makes the oppressed to obey without thinking.

answer; $5.75.

i think idk if im right but i think its d

awnser: william shakespeare was an english poet, playwright, and actor, widely regarded as the greatest writer in the english language and the world's pre-eminent dramatist.