Question: A student performs an experiment and the results are shown below: Before- Iron filings are brown, small, and magnetic: Copper sulfate crystals are blue, brittle, and not magnetic. After- The copper formed was reddish, solid, and not magnetic: Iron sulfide solution was colorless and not magnetic. Which statement supports that a chemical reaction took place?

  Options: 
 A. Changes in color occurred.
 B. A new substance was formed.
 C. A physical change in the iron occurred.
 D. The original substances were present after.
Answer: B