Answer:
C. People began to exchange goods and ideas among vastly different cultures
Explanation:
From what I can see there are multiple correct answers. B and C are both correct. If you can only pick one I'd go with C. More recently businesses have moved more into cities.
Now, up until just before the U.S. declared war on April 6th, 1917, the U.S. had desperately tried to stay neutral, but ties to Britain, propaganda, the sinking of ships by German U-boats, and a German attempt in the Zimmermann Note to get Mexico to declare war on the U.S. pushed the U.S. to getting involved.
