Please choose the correct answer to the 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

Answer1: an observation Answer2: a conclusion Answer3: a generalization Answer4: an assumption of the investigation Answer5: a hypothesis

Answer format: answer1/answer2/answer3/answer4/answer5
Answer: answer1