worldwide vaccination for smallpox global education about smallpox better worldwide urban sanitation improved global quarantine facilities
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which tool is most responsible for preventing future pandemics of smallpox?
Possibilities:
- worldwide vaccination for smallpox
- global education about smallpox
- better worldwide urban sanitation
- improved global quarantine facilities

worldwide vaccination for smallpox