what is evidence of a chemical reaction? a. dissolving b. changing size c. giving off light d. changing…

Brief Explanations:

A chemical reaction involves a change in the chemical composition of substances. Dissolving, changing size, and changing state of matter are physical changes. Giving off light can be a sign of a chemical reaction as it often indicates the release of energy due to chemical - bond breaking and forming.

Answer:

C. giving off light