Following Archduke Franz Ferdinand's assassination, Austria-Hungary: A. used the attack to justify taking aggressive action against Serbia
. B. supported the Ottoman Empire in its efforts to keep Serbia under its control
C. broke its military alliance with Germany, which had refused to condemn the Serbs.
D. joined the Triple Entente to defend itself from future Serbian attacks.

Correct answer is A. used the attack to justify taking aggressive action against Serbia .

Explanation:

Option A is correct because after the  assassination on June 28th 1914, Austria-Hungary declared war on Serbia on July 28th, starting a great offensive on its western and northern boundaries.

B is not correct as Ottomans entered the war in later stage, and Serbia was not their territory.

C is not correct as Germany stayed on the side of Austria-Hungary.

D is not correct as Triple Entente fought against Austria-Hungary in this war.

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