Answer:
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Step-by-step explanation:
The scene described in the excerpt is most likely caused by:
B. A poison gas attack on soldiers in the trenches.
The mention of "smoke and fumes," the impact on visibility, and the description of men being thrown into a comatose or dying condition are indicative of a poison gas attack, a tragic and devastating aspect of World War I. The use of chemical weapons, including poisonous gases, was a horrific and notorious feature of trench warfare during that time.