I think the answer is D, I might be wrong though but hope I helped! Sorry if I didn't!
One of the advantages was that the old mom & pop stores were no longer practical, because the corporations were more convenient. You didn't have to ride around to go to seven stores anymore, you would just go to the big-block store and get everything you needed there. Furthermore, corporations provided a large amount of unskilled jobs - previously, the largest part of the "American dream" was to go and start your own business, farm, etc., but now you could go get a job at a factory or supermarket, so the job market was diversified. Those are just two, but I'm sure you can think of more!
The answer is : <span>Conquest of the Roman empire followed by Germanic invasions</span>
Well some rivers in Europe are used to transport goods. Sometime people even travel on them. River also can provide power.
