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What was one of the effects of the development of machine guns and barbed wire on warfare from 1914 to 1918?

A. Casualties were low because soldiers were protected.
B. Soldiers were able to advance rapidly on one another.
C. Field commanders no longer thought it mattered who attacked first.
D. Soldiers dug trenches because they could not advance without heavy casualties.

User Pseudoku
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Answer:

D. Soldiers dug trenches because they could not advance without heavy casualties.

Step-by-step explanation:

User Leo Arad
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