Answer:
B. citing scientific evidence
Explanation:
In the essay "On the Mode of Communication of Cholera," the primary technique that author John Snow uses to support his claim that cholera spreads from person to person is "citing scientific evidence".
Snow scientifically revealed how cholera is transmitted through the medium of polluted water, its propagation by morbid poison that enters the alimentary canal and its communication in crowded areas were poor people reside.
Snow showed that cholera specifically showed how the disease spread by water contaminated by faeces.
John Snow was an English Physician and also led in the development of medical hygiene.
