Ok the true answer is (e) all of the above
While I have never read the book (because it is historically inaccurate - so don't get too sad, because it never could have happened), there are many words that would signal a flashback. Flashbacks are a time of reflection, so there are many past tense verbs used. You may also see things like, "Back in my day...", "As I think back...", "When I was a young boy...", "As I remember...".
Answer:
b. They are the most important ideas in a text.
d. They are supported by details.
e. They can be explicitly stated or implied.
The central ideas of a text are those that are most important. The rest of the text is built around these main ideas. Main ideas also tend to be supported by details which expand on their information and claims. Finally, main ideas can be either explicitly stated or implied, without altering their importance and relevance to the text.
After getting Cyclops drunk on wine, Odysseus takes away his eye. Cyclops invited Odysseus not to kill him but to bring to his notice that it was Odysseus who was destined to take his eye. Cyclops wanted to befriend him.