Question

which scientific information most likely lead to school districts requiring vaccines? some required vaccines have side effects. some people prefer not to vaccinate their children. vaccines prevent diseases and can improve a school’s safety. vaccines were invented by edward jenner to treat smallpox.

Explanation:

School districts require vaccines to protect the student population. The option that directly links vaccines to improving school safety (a core goal for such mandates) is the scientific information that would drive this policy, as reducing disease transmission in a school setting enhances overall safety. Other options either address side effects, personal preferences, or historical invention, which do not directly support the rationale for a school vaccine requirement.

Answer:

Vaccines prevent diseases and can improve a school's safety.