The correct answer is:
to draw attention to the doctors and scientists who expanded on Semmelweis’s breakthroughs.
This choice is most in line with the author’s intent, as the mention of Joseph Lister and Robert Koch serves to highlight how subsequent figures built upon Semmelweis’s foundational work on hygiene and infection control. This emphasizes the ongoing evolution of medical practices and acknowledges the broader implication of Semmelweis's findings in the field of medicine. The other responses do not fully capture this purpose.