Final answer:
Using a commercial-grade sanitizer will substantially reduce the number of bacteria on surfaces, but will not lead to a sterilized environment as some microbes may persist.
Step-by-step explanation:
Sanitizing with a commercial-grade sanitizer is designed to substantially reduce the number of bacteria on surfaces to levels considered safe for public health, which answers the question given: B) substantially reduce the number of bacteria. Sanitizers include both chemical compounds and processes like high heat that can effectively control microbial growth. Disinfection with chemicals like chlorine bleach or agents such as quats, bisbiguanides, and alkylating agents can inactivate numerous microbes, although it is important to note that it typically does not lead to a sterilized environment as some microorganisms, like endospores, may survive.