showing some graphs making a conclusion developing a hypothesis collecting some data
I gave my students this multiple choice question: Two students are studying what makes ice melt fastest. They want to conduct an investigation. During which of these steps in their investigation will they measure the ice?

Only one answer is correct among these 4 choices:
- showing some graphs
- making a conclusion
- developing a hypothesis
- collecting some data

Could you tell me which one is correct?

collecting some data