Assassination of franz ferdinand 28 june 1914 and rms lusitania sinks 7 may 1915 are closely associated with which conflict or war

if it were me, i would pick c. c is the best answer because it's basically saying go on a non-violent strike for india

polticians and sentates thought to annoucne the fialre of articles of confedartion by making a centralized nation as a hole

can someone me with this question:  

1) the end of the conflict between the north and the south didn’t just mark the end of a war; it marked the end of an entire way of life.” which statement best describes what this statement means?  

a) the southerners were no longer free and were controlled by the northern states.

b) the industrial economy in the north was not sustainable.

c) slavery became illegal, which changed completely the south’s labor force and the agricultural economy was destroyed.

d) the states decided to relinquish their independence and return to britain’s rule.    

i believe that d is the right answer