Which sentence best describes the influence of alliances on the start of World War I?

Before World War I, European countries had formed rival alliances. When Austria-Hungary and Serbia came into conflict, alliance commitments drew other countries into the fighting, expanding the conflict across Europe. Thus, “alliances between nearly all European nations meant that when two went to war, all became involved” is the best description; the alliances did not prevent war or require disputes to be settled peacefully.

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