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
A. an observation
B. a conclusion
C. a generalization
D. an assumption of the investigation
E. a hypothesis
Answer: A