The Work of Lister, Nightingale, and Semmelweis All Contributed to Controlling

The work of Lister, Nightingale, and Semmelweis all contributed to controlling infectious disease by

A) developing techniques for isolating pathogens.
B) developing methods for reducing nosocomial infections.
C) identifying the sources of infectious agents.
D) determining the taxonomic relationships among microbes.
E) developing vaccines.