Place these events in the correct order. austria declared war on serbia. russia mobilized its forces. britain declared waron germany. germany declaredwar on france andrussia. archduke ferdinand was assassinated.

1) Archduke Ferdinand was assassinated.

2)Austria declared war on Serbia.

3)russia mobilized its forces.

4)Germany declaredwar on France andRussia.

5)Britain declared waron Germany.

i think the answer is b.

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