Choose the option that best completes the underlined part of the sentence.

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.

Title

Whereas both Europe and

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