Answer:
b. Soldiers returning home from the trenches brought the flu with them
Explanation:
the pf text book states the following:
"The outbreak began as the war was ending so, as soldiers returned home, they brought the deadly flu virus with them. "
hope that helps!!
World War I and the influenza pandemic of 1918 were closely intertwined. The war fostered influenza in the crowded conditions of military camps in the United States and in the trenches of the Western Front in Europe and the soldiers returning home from the trenches brought the flu with them.
The 1918 influenza pandemic, commonly known as the Spanish flu, was an exceptionally deadly and most severe epidemic caused by the H1N1 influenza A virus of avain origin. It was one of the most terrible outbreaks of disease in history. It spread across the globe in three waves in 1918–19; nearly one third of the world population tallying 1.8 billion was infected, and approximately 50–100 million died from the disease in less than a year.
World War I (WW I), started on 28 July 1914 and lasted till 11 November 1918. Germany, Austria-Hungary and the Ottoman Empire pitted against Great Britain, the United States, France, Russia, Italy and Japan. In the end, the Central Powers were defeated.
The correct answer is option B.
Know more about 1918 influenza pandemic here
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