Answer:
Germany
Explanation:
Germany became the first nation in the world to adopt an old-age social insurance program in 1889, designed by Germany's Chancellor, Otto von Bismarck. The idea was first put forward, at Bismarck's behest, in 1881 by Germany's Emperor, William the First, in a ground-breaking letter to the German Parliament.
C. Citizens and their government agree to enter a social contract.
The answer is Violence related to slavery.
In WW1 soldiers faced a lot of threats in the trenches , the worst would be disease
