The answer is D. The price of goods increased.
When you are dealing with supply and demand. The less you can produce the more expensive it is. But in this case with the growth of the railroads delivering steady supplies the prices would go down, not up.
Hope this helps. :)
Its is D In closed meetings, by small group of privileged citizens
The following title is most appropriate for this chart describe the 19th century:
( D ) The Closing of the West
By Transcontinental Railroad