wearing gloves while handling the samples cleaning all materials they have finished using bringing food and drinks into the laboratory washing hands before leaving the laboratory
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Students are performing an investigation to determine the types of bacteria that grow inside their school. Which activity should the students avoid while performing this investigation?
Possibilities:
- wearing gloves while handling the samples
- cleaning all materials they have finished using
- bringing food and drinks into the laboratory
- washing hands before leaving the laboratory

bringing food and drinks into the laboratory