an observation a conclusion a generalization an assumption of the investigation a hypothesis
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Maria collected the gas given off by a glowing piece of charcoal. The gas was then bubbled through a small amount of colorless limewater. Part of Maria's report stated, "After the gas was put into the jar, the limewater gradually changed to a milky white color." This statement is
Possibilities:
- an observation
- a conclusion
- a generalization
- an assumption of the investigation
- a hypothesis

an observation