Tie back long hair. Refrigerate all chemicals. Label all test tubes and bottles correctly. Dispose of extinguished matches properly.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of these is an important safety rule to follow when using chemicals?
Possibilities:
- Tie back long hair.
- Refrigerate all chemicals.
- Label all test tubes and bottles correctly.
- Dispose of extinguished matches properly.

Label all test tubes and bottles correctly.