by taking medication daily by preventing transmission between people by wearing clean clothing daily by performing dental hygiene three times each day
I gave my students this multiple choice question: How can the rate of an infectious disease be drastically reduced?

Only one answer is correct among these 4 choices:
- by taking medication daily
- by preventing transmission between people
- by wearing clean clothing daily
- by performing dental hygiene three times each day

Could you tell me which one is correct?

by preventing transmission between people