a conclusion a fact an observation a prediction
I gave my students this multiple choice question: A group of students was preparing an activity to determine whether certain materials will float or sink when placed on water. Before the experiment started, one student said, "I think the sponge will float." This statement was

Only one answer is correct among these 4 choices:
- a conclusion
- a fact
- an observation
- a prediction

Could you tell me which one is correct?

a prediction