Vaccines help prevent illnesses. Vaccines keep the environment cleaner. Vaccines help cure people who are sick. Vaccines kill bacteria that cause infections.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: New vaccines for diseases are being developed all the time. How do vaccines most likely help people?
Possibilities:
- Vaccines help prevent illnesses.
- Vaccines keep the environment cleaner.
- Vaccines help cure people who are sick.
- Vaccines kill bacteria that cause infections.

Vaccines help prevent illnesses.