Answer:
(1) is the correct answer.
Explanation:
The archduke was in Sarajevo in June 1914 to inspect the armed forces in Bosnia and Herzegovina. Bosnia and Herzegovina were annexed by Austria-Hungry in 1908. The Serbians hated this annexation because they believed that Bosnia- Herzegovina was a part of Serbia. The archduke was killed by the Serbian nationalists. This assassination led to a chain of events that culminated in the first world war. Austria-Hungry declared war on Serbia on 28th July. Russia entered the war in support of Serbia and Germany in support of Austria-Hungary.
