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

Tanks could cross trenches and move over rough, dangerous ground while shielding soldiers from some enemy fire. This helped break through defensive trench lines, so the tank’s most important effect was weakening the use of trenches for defense. Choice B, “The tank ended the use of trench warfare for defense,” is the best answer, although tanks did not eliminate trench warfare immediately.

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