One month after the
declared war on
assassin ation of Archduke Ferdinand.
A. Austria-Hungary, Russia
B. Austria-Hungary, Serbia
C. Serbia, Austria-Hungary
D. Germany, Austria-Hungary

B. Austria-Hungary, Serbia

Explanation:

It then sent Serbia an ultimatum, worded in a way that made acceptance unlikely. Serbia proposed arbitration to resolve the dispute, but Austria-Hungary instead declared war on July 28, 1914, exactly a month after Ferdinand's death.

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C. Serbia, Austria-Hungary

Explanation:

It was suspected that serbia help the assassin via funding so austria felt angary towards serbia so austria send in impossible task to go to war with serbia

the answer should be:

their party has more members.

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the process of industrialization is called a revolution because