Whereas both Europe and China use standard railroad gauge (1435 mm), Russia deliberately chose the wider "Russian gauge" (1520 mm) that gives greater side-to-side stability in railways cars and, more importantly, acts as a national defense, so that it would block a foreign army's supply line and preventing these bordering powers from invading by train.
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Aacts as a national defense, so that it would block
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Bacts like a national defense, so as to block
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Cacts as a national defense, blocking
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Dacting as a national defense, blocking
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Eacting like a national defense, would block
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正确答案: C