turn off any electrical equipment dispose of waste materials wash hands and tabletops thoroughly return materials to their proper place
I gave my students this multiple choice question: A student conducts an experiment using a common but potentially harmful bacteria culture. After working with the bacteria, which is the most important safety practice to follow?

Only one answer is correct among these 4 choices:
- turn off any electrical equipment
- dispose of waste materials
- wash hands and tabletops thoroughly
- return materials to their proper place

Could you tell me which one is correct?

wash hands and tabletops thoroughly