What is central idea (how is it different from main idea? )

Which is the most effective paraphrase of the passage "six benches were left empty in every ship that evening when we pulled away from death. and this new grief we bore with us to sea: our precious lives we had, but not our friends" - the odyssey

What is the most likely the cumulative impact of the use of the word depict or depictions

Hi brothers and sisters may you tell me the answer of question ?