wash hands. tie back long hair. clean all glassware. turn off Bunsen burner.
I gave my students this multiple choice question: When finished with a laboratory investigation the last thing a student should do is to

Only one answer is correct among these 4 choices:
- wash hands.
- tie back long hair.
- clean all glassware.
- turn off Bunsen burner.

Could you tell me which one is correct?

wash hands.