Dr John Snow, Personal Physician to Queen Victoria, Became Known

Dr. John Snow, personal physician to Queen Victoria, became known as the "Father of Epidemiology" because of his work in stopping the cholera outbreak in London in 1854. Specifically Dr. Snow did all the following (Select all that apply)

A) mapped out the geographical locations of the 500 deaths that occurred in about 10 days that year
B) analyzed the data on which water pumps had been most used in the Soho district where the majority of deaths occurred
C) removed the water pump handle from the well that had infected the most patients
D) identified a brewery well as the source of the cholera outbreak