Which sentence from “Nicholas’s Diary: April 2 and 3” contains an analogy?

"He has always been as quiet as a mouse about the treasure that he finds, scurrying away with his equipment in the morning and piling up his treasure in his study."

“Even though he says he always comes home with something, he has never shown it to me or even told me what type of treasure it is.”

“Is it gold, or silver, or maybe it’s precious jewels? Whatever it is, tomorrow I will find out…”

“…hopefully he’ll let me bring some to class so that I can show my friends since I’ve been bragging about it to them ever since Dad told me I could go!”