Which of the following describes the most important effect the tank had on World War I?

Tanks could cross rough, cratered ground and barbed wire while shielding soldiers from some machine-gun fire. This helped armies break through defensive trench lines, so the tank’s most important effect was undermining trench warfare as a defense. Tanks did not end trench warfare immediately, but they were developed to overcome its stalemate; they did not increase its use.

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