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?
1) citing personal anecdotes
2)citing scientific evidence
3)describing people’s experience
4)citing hypothetical situations

Ipronounced his name, offering him at the same time my hand: he took it, smiling and saying, “we shall do very well by-and-by.” then he laid me down, and addressing bessie, charged her to be very careful that i was not disturbed during the night. having given some further directions, and intimates that he should call again the next day, he departed; to my grief: i felt so sheltered and befriended while he sat in the chair near my pillow… (chapter 3) this passage, in which jane first meets the doctor, is an example of