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The minimum number of people required to safely work at a confined space site is two. This is because one person is needed to enter the confined space and perform the work, while another person remains outside to monitor their safety and provide assistance in case of an emergency.

Having two individuals fosters a safety system where the person outside can call for help if needed or execute a rescue operation should conditions inside the confined area become hazardous. It reflects standard safety protocols for working in confined spaces, which often include specific regulations that dictate the presence of at least one additional person outside of the space.

Though having three or four individuals can strengthen safety measures by adding more monitoring and assistance capabilities, it is not strictly required by regulations as long as two people are present, making two the correct and minimum answer while ensuring compliance with safety standards in such environments.