Answer:
It is easy to identify a main idea that is directly expressed in the text. Main ideas are often found at the beginning of paragraphs. The first sentence often explains the subject being discussed in the passage. Main ideas are also found in the concluding sentences of a paragraph.
The theme is the main subject that you are going to write about in a essay or in a report. If you want to know more, just ask :)
It is the use of C. a flashback.
A flashback refers to a scene that happened before in the timeline. So if you are writing something in a chronological manner, it means that you are going to write it in the order that the events happened. If you suddenly introduce a flashback, you are going to break the flow of chronological events.
Keats used the Petrarchan sonnet form. The repeated rhyme-scheme of the octet helped it capture the power, sounds and moods of the sea
