Question: Which event is often cited as the immediate cause of World War I?

Options:

1. The sinking of the Lusitania
2. The assassination of Archduke Franz Ferdinand
3. The invasion of Belgium
4. The Treaty of Versailles

Correct Answer: The assassination of Archduke Franz Ferdinand

Solution:

The assassination of Archduke Franz Ferdinand in 1914 is often cited as the immediate cause of World War I.