applying disinfectant to the counters throwing away plant material in the trash washing hands with an antibacterial soap placing hands under an ultraviolet light
I gave my students this multiple choice question: What procedure should be performed after any handling of a plant sample in a lab?

Only one answer is correct among these 4 choices:
- applying disinfectant to the counters
- throwing away plant material in the trash
- washing hands with an antibacterial soap
- placing hands under an ultraviolet light

Could you tell me which one is correct?

washing hands with an antibacterial soap