pour the solution down the sink neutralize the solution with a base dilute the solution with more acid absorb the liquid with paper towels
I gave my students this multiple choice question: What is the proper procedure for safely disposing of an acid solution after finishing an experiment?

Only one answer is correct among these 4 choices:
- pour the solution down the sink
- neutralize the solution with a base
- dilute the solution with more acid
- absorb the liquid with paper towels

Could you tell me which one is correct?

neutralize the solution with a base