There are no answer choices so I can't be sure exactly what you're looking for, but I'd say paragraph.
A stanza is a group of lines forming the basic recurring metrical unit in a poem, used to separate topics and build a piece of poetry neatly. A paragraph is a distinct section of a piece of writing, usually dealing with a single theme and indicated by a new line, indentation, or numbering. Paragraphs separate thoughts and topics and are a building block for an essay or prose.
Hope this helps! Work hard!!
Answer: Hyperbole
A hyperbole is an exaggeration that is not meant to be taken literally. It is usually used to make a persuasive point or to add emphasis. In this case, "opening a door to eternal tyranny" is an example of an exaggeration of this type. While it is likely that tyranny will not be eternal (the country itself will not be eternal), its purpose is to emphasize the risk of keeping the seat of governent vacant.
Let's start with an obvious one. He certainly is not a coward. He was willing to take on a dog that was ferocious; in contrast, Heathcliff makes the comment that the "cowardly children also crept forward..." That quoted phrase is somewhere near the very end.
Your first example of yellow underlining is a wonderful example. Heathcliff is quite common and he would use common English. He characterizes Cathy as being gentile and not given to saying anything contrary to her upbringing.
I would note that Heathcliff followed grumbling execrations and vengeance. [an execration is a threat denouncement or curse. Again Heathcliff is showing his common upbringing. Cathy would choke before she would utter such things. This one is kind of iffy. You could omit it. It is by inference something that shows that Heathcliff is different].
Your second underlined statement is correct. It characterizes Heathcliff as a robber and a thief and part of a lowlife gang. You could go on. Robert does not hesitate to make his feelings known and adds to what you underlined.
Your third underlined statement is correct as well. I have added two but your examples are fine.
Who marks this? Make an appeal if you get it wrong. Interpreting literature is that way. This is not exactly a factual question and the only way to answer it is to compare Heathcliff to someone else. I chose Robert and Cathy. Write your instructor and provide some of the evidence you have provided here.