Suppose a reaction were to happen in an open container in a lab. During the reaction, the scientist observes the chemicals bubble, and produces a gas. During the analysis the scientist notices that the reactants weighed 20 g when he started, and the product weighed 18 g. Explain what happened.

a. His chemical reaction defied the law of conservation of mass

b. The product destroyed mass during the reaction

c. The reactants created matter during the reaction

d. The gas that was produced was not able to be weighed since the container was open.