A
He studied details about working in a slaughterhouse.
B
He studied details about the home lives of slaughterhouse workers.
C
He opened a slaughterhouse to see firsthand how it worked.
D
He saw a documentary film about slaughterhouses in a local theater.
C.International Negotiations
D. Poltiical Parties
It would appear from some reading I have done that democracy originated in Ancient Athens around 508 BC. If you need more information on this, you can let me know:)