Answer:
3.
Explanation:
The old floor is under the weight of two workers, which means there's something heavy on top of the floor. "The old floor moaned and complained", old floors can't talk, this sentence is comparing human characteristics to the creaks and sounds of an old flooring. And that is what personification is, when a sentence compares objects or things to human emotions, reactions, and actions as a metaphor.
Hope this helped! :)