Answer:
What I heard was that people in the science laboratory in china "accidently" let loose a virus that they were studying, which also led to that person in contact with it to go out and spread it without knowing. Causing the virus to spread across all the world within a few months.
That is my explanation! \_(ツ)_/
Answer:
Letter B . Factory jobs increase urban migration
I would say the answer is C) an easier life than is the East. The life going out West was very challenging.
Hope this helps! Please let me know if I'm wrong. :)