Which of the following resulted most directly from louis pasteur's work with bacteria?

production of chemical weapons
better standards for public health
development of agricultural insecticides
improved conditions for child workers

Well, Louis Pasteur was a scientist who discovered a process called "pasteurization." What this process is is heating food or whatever liquids to kill the bacteria which might be in it. This process became widely used for milk, as well as for vaccines. It improved food safety for the public and provided for a way that people can get vaccinated so that their immune systems are resistant to disease. So from my knowledge, I would say "better standards for public health" is your answer.