The immediate spark which caused WWI was
the arms race
tension of nationalism
the alliance between Russia, France, and Britain
the heir to the throne of Austria-Hungary was assassinated
the heir to the throne of Austria-Hungary was assassinated
The immediate spark that caused World War I was the assassination of Archduke Franz Ferdinand, the heir to the throne of Austria-Hungary. This event occurred on June 28, 1914, in Sarajevo, Bosnia, when a Bosnian Serb nationalist, Gavrilo Princip, shot and killed the Archduke and his wife.
To find this answer, you can start by researching the causes of World War I. Look for reliable historical sources such as books, articles, or reputable websites that discuss the origins of the war. These sources will provide detailed accounts of the political, social, and economic factors that contributed to the outbreak of the war. Paying special attention to events leading up to June 28, 1914, will help you understand the significance of the assassination as the spark that ignited the conflict.