Which of the following describes the most important effect of the tank out on world war i?

The tank was first used at the little known Battle of Flers. It was then used with less success at the Battle of the Somme. Though the tank was highly unreliable – as one would expect from a new machine – it did a great deal to end the horrors of trench warfare and brought back some mobility to the Western Front.

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i would need the graph to answer the question

ththis should be under spanish