wearing protective clothing and goggles keeping the window open closing the door to the hall using bright fluorescent lights
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which is the most important safety measure to follow when using an acid in a classroom laboratory?
Possibilities:
- wearing protective clothing and goggles
- keeping the window open
- closing the door to the hall
- using bright fluorescent lights

wearing protective clothing and goggles