What was the immediate cause of World War I?
A
The alliance that was built between Britain, France, and
Russia
В
The shooting of a member of the Austrian royal family
C Longstanding tensions between France and Germany
D
The sinking of a ship called the Lusitania

The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. ... When Russia began to mobilize due to its alliance with Serbia, Germany declared war on Russia.