HELP ASAP Which statement best summarizes the third paragraph of “Economy” in Walden?

Having finished framing his house, he sought out another house to dismantle for building materials. He found one and bought it cheaply.
First he constructed the frame of his house, and then he bought the boards. The boards came from another house.
His house frame was ready for its boards by mid-April. He had gotten the boards from a small, run-down building he purchased for a good price.
The building he took his house’s boards from was not in very good shape. The price was reasonable, though.