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Answer: (d) Russia

After the murder of Archduke Franz Ferdinand at Sarajevo, Austria-Hungary declared war on Serbia on 28 July 1914. Russia, the protector of the Slav nations, came to Serbia’s help; Germany then declared war on Russia and France, and the First World War began.

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report
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