The central idea that can be gotten from the passage is that D. Anagnos shows his generosity as he gives his wise advice and his expensive present to Annie.
The central idea simply means the main idea that's in a passage or story. It's what the author wants the readers to know.
From the information given, it can be noted that the summary is that Anagnos shows his generosity as he gives his wise advice and his expensive present to Annie. A garnet ring was given as a gift.
