Question

austria-hungary declared war on serbia soon after

○ germany led an attack on serbia.
○ germany declared war on russia.
○ a serbian assassinated the leading german general.
○ a serbian assassinated the archduke of austria-hungary.

Explanation:

The event that led to Austria - Hungary declaring war on Serbia was the assassination of Archduke Franz Ferdinand of Austria - Hungary by a Serbian nationalist (Gavrilo Princip). Let's analyze the options:

• Option 1: Germany did not lead an attack on Serbia before Austria - Hungary declared war on Serbia.
• Option 2: Germany declared war on Russia after Austria - Hungary declared war on Serbia and Russia started to mobilize.
• Option 3: A Serbian did not assassinate a leading German general; the assassination was of the Austrian - Hungarian archduke.
• Option 4: This is correct as the assassination of Archduke Franz Ferdinand by a Serbian (Gavrilo Princip) was the immediate cause for Austria - Hungary to declare war on Serbia.

Answer:

D. a Serbian assassinated the archduke of Austria - Hungary.