A linking verb connects two parts of a sentence. Auxiliary verbs are used to create complex tenses, such as future perfect continuous (will have been going - where <em>will have been </em>are all auxiliary verbs). Intransitive verbs are intransitive - they are not linking.
So, having this in mind, the most common linking verbs are various forms of be.
For example:
She <u>is</u> very tall.
The right answer for the question that is being asked and shown above is that: "Chapter 1 focuses on Becky's frustration, while Chapter 2 focuses on her driving." The comparison that is correct is that <span>Chapter 1 focuses on Becky's frustration, while Chapter 2 focuses on her driving.</span>
At its core the Harry Potter series is about our attitudes towards death, and how we face the idea and reality of it. As mentioned above, Lord Voldemort was defined by his fear and anxiety of death, and devoted his life to conquering and worrying about it.
It wants you to look at the text and focus on the form of the text and the structure and language. I don't know how else to help you without a picture.