pouring water into an acid pouring a base into water pouring water into alcohol pouring alcohol into a base
I gave my students this multiple choice question: Which of the following laboratory practices should be avoided?

Only one answer is correct among these 4 choices:
- pouring water into an acid
- pouring a base into water
- pouring water into alcohol
- pouring alcohol into a base

Could you tell me which one is correct?

pouring water into an acid