Trench warfare most likely led to stalemates during World War I by making it:
According to the given question, we are asked to state how trench warfare most likely led to stalemates during World War I and the reason why it was so popular.
As a result of this, we can see that trench warfare had to do with soldiers fighting in trenches which were depths dug under the earth where they could take cover from coming enemy fire. This led to a lot of stalemates as it was difficult to gain an advantage.
Therefore, the correct answer is option A
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