Answer:
I think it's A or B because C & D doesn't make sense with the question .
A) Factories.
Hope this helps.
Answer:
I am not 100% sure on this answer but if you look at the time frame and other events that happened in or around that time you can kinda use proccess of elemination and end up with
B. Europeans reduced freedom and forced colonized people to work for little to no wages.
Let me know if this is wrong.
I'm pretty sure if not he was coronated by Pope Leo III in AD 880, giving him the Devine right to rule over his Empire because Charles did become a Emperor