The answer to this would be A. This is the right answer because in he thesis it states, "Yet key technological developments caused a rapid growth in American urban areas." Hope this helped! BTW it would be awesome if you awarded this "brainliest answer"
I can't write your essay for you but I use prepostseo.com which is an article rewriter that makes sure it doesn't plagiarize. You basically copy an article and paste it in.
