I would say that the adverbial phrase is: D. Without a care.
The Civil Disobedience impacted people and events later in history by creating a "culture" which encourages people especially the youth to rebel against the government and disobey the rules set by the government. It acted as a catalyst for rapid political change and also fortified the beliefs of those who thought the government acted unfairly.
Since historical fiction usually talks about a certain era in history, I'd say the correct answer is that 'it's set against a historical backdrop'. hope it helps you
1. I couldn't get to work until I tidied my desk.
2. Jennifer always remembers her mother's birthday.
3. The winning care in the race was driven by an Italian.
4. The postman arrived while we were eating breakfast.
5. I was still checking my test when the examiner told me to stop.
6. Allan was very tired that night because he studied hard all day.
7. The boys would play football after school.
8. This is the house where I used to live when I was a boy.
