Final answer:
Louis Pasteur was significant in establishing the germ theory of disease by connecting microorganisms with disease transmission and development, and he developed pasteurization to ensure food safety. The best fit for the answer is b Connecting disease transmission with disease.
Step-by-step explanation:
Louis Pasteur, a noted French chemist and microbiologist, made groundbreaking contributions to our understanding of the germ theory of disease, food preservation, and vaccinations. Specifically, Pasteur is credited with the discovery that microorganisms cause fermentation and spoilage, which led to his development of the process of pasteurization to combat these issues. One of Pasteur's significant achievements is connecting the presence of microorganisms with the transmission and development of diseases, leading to the foundation of germ theory and subsequent improvements in public health.
While Pasteur's work did touch upon improving food safety and the development of vaccines, the correct answer to the student's question is that Louis Pasteur was notable for 'b Connecting disease transmission with disease.'