put all non-reusable glass in the trash. pour all used chemicals down the sink. collect and store recyclable material. return used samples to natural settings.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The correct procedure after completing a laboratory experiment is to
Possibilities:
- put all non-reusable glass in the trash.
- pour all used chemicals down the sink.
- collect and store recyclable material.
- return used samples to natural settings.

collect and store recyclable material.