the quality of food. the prediction of weather. the availability of medication. the effectiveness of vaccinations.
I gave my students this multiple choice question: Louis Pasteur's work in the nineteenth century on pasteurization greatly improved

Only one answer is correct among these 4 choices:
- the quality of food.
- the prediction of weather.
- the availability of medication.
- the effectiveness of vaccinations.

Could you tell me which one is correct?

the quality of food.