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wnich two of the following are MAIN ideas of the article?
1. The Congress of Vienna was a meeting to set up rules for countries in Europe.
2 Countries in Europe were arguing over borders and power.
3 The assassination of Franz Ferdinand led to countries declaring war on each other.
4. The war ended the reigns of royal leaders in several different countries.
(A)
1 and 3
(B)
1 and 4
(C)
2 and 3
(D)
2 and 4