tell the teacher immediately stop the experiment immediately sweep the glass into a biohazard container use a paper towel to pick up the pieces
I gave my students this multiple choice question: What safety procedure should a student follow when a thermometer is broken during a lab experiment?

Only one answer is correct among these 4 choices:
- tell the teacher immediately
- stop the experiment immediately
- sweep the glass into a biohazard container
- use a paper towel to pick up the pieces

Could you tell me which one is correct?

tell the teacher immediately