Hey there,
Your question states: "In the essay "On the Mode of Communication of Cholera," what is the primary technique that author John Snow uses to support his claim that cholera spreads from person to person?"
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Answer/Reason: Your correct answer would be "citing scientific evidence". The reason why so would be basically that is a good way of proving or in the case, the primary technique that author John Snow uses to support his claim which concludes that he would use scientific evidence to support everything that he is going to states:
Hope this helps.
~Jurgen
