Question

on june 28, 1914, the archduke franz ferdinand of austria was assassinated by
special agents sent by russia.
the german kaiser.
a serbian nationalist.
a member of the british royal family.

Explanation:

The assassination of Archduke Franz Ferdinand in 1914 was carried out by Gavrilo Princip, a Serbian nationalist. The other options are incorrect: Russia didn't send agents, the German kaiser didn't assassinate him, and a British royal family member was not involved.

Answer:

C. a Serbian nationalist.