The reason why surveying a different number of people or different population of people can possibly change the percentages that you calculated is because these surveys are simply "samples" of the general population as a whole, and are not exact in terms of their results given any random sample.
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The correct answer here is D
<span>D. Returning soldiers spread Spanish flu, killing millions, and leaving others unable to work.
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<span>It has been cited as the most devastating epidemic in recorded world history. More people died of influenza in a single year than in four-years of the Black Death.Dealing with this flu added problems to already strained economies.</span>
