The weapon that helped continue the stalemate on battlefields during World War I is option<em> D. Machine Gun</em>. A stalemate is a situation in which neither side has a clear victory over the other. The war becomes very long and slow, and armies have to be creative to surprise the enemy. There were many stalemates in WWI, especially in the Western Front.
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Why do you think flowing, organic shapes would be a key feature of an art form that is viewed as "secular"? Rococo was highly secular, emphasizing grace, charm, and gentle action, a lot of the artist liked how it looked when using the style.
Explanation:
Their ethnicity / culture / nationality?