perform investigations using only new materials throw away glass items after investigations are complete clean up all materials and workspaces after investigations eat in the laboratory only after investigations are complete
I gave my students this multiple choice question: Which is the best way a science student can help to maintain laboratory equipment?

Only one answer is correct among these 4 choices:
- perform investigations using only new materials
- throw away glass items after investigations are complete
- clean up all materials and workspaces after investigations
- eat in the laboratory only after investigations are complete

Could you tell me which one is correct?

clean up all materials and workspaces after investigations