Who started ww1??? pls answer lol

Required Answer:-

Austria started world war 1

Explanation:-The Balkans battle Between Countries of Europe between 1912-1913 had already become the preliminary reasons .But In 1914 when The pressure between Serbia and Austria due to Adiatric Sea Collisions was going on .Then The prince and princess of Australia Had been killed by a member of blackhand gang .Austria directly suspect Serbia for this.On July 23, 1914 Austria sent a 10 pages agreement for Serbia .Serbia signed most of treaties of them on the pressure of western countries but many left.Austria Reacted on it and declared war against Serbia on July 28,1914.

C. the delegated powers