completely clear the area. leave the area as you found it. take anything you may need later. destroy specimens once you have observed them.
I gave my students this multiple choice question: When conducting a scientific experiment in the field, you are expected to

Only one answer is correct among these 4 choices:
- completely clear the area.
- leave the area as you found it.
- take anything you may need later.
- destroy specimens once you have observed them.

Could you tell me which one is correct?

leave the area as you found it.