The correct answer is: 1. Metal filled the house.
As we compare the animals mentioned in the excerpt bellow we can see that they are characterized by having a special place to live, a place that they constructed. By putting the adjective “iron” before their names the author indicates that that material in particular is their favorite as well as Fredo's. Nothing in the metaphors indicate that those places have organization and tidiness in common so number 2 is incorrect. Fredo’s house may be only safe for him so number for is incorrect too. And all of those habitats are different so his house is not mimicking one in particular.
Answer:
I'd be jealous too maybe she can do that for me