How does Don Anselmo’s sale of his land, but not the trees on that land, help reveal a theme in the story?

Don Anselmo’s action allows him to make more money on his land than the Americans want to pay.
Don Anselmo’s action allows him to keep possession of the orchard on the property he sold.
Don Anselmo’s action allows him to continue to plant trees on the land he sold to the Americans.
Don Anselmo’s action allows him to ensure that his entire community prospers from the sale of his land.