Final answer:
All the options listed (A: Color change, B: Change in temperature, and C: Formation of a precipitate) are correct indicators of a chemical change, which signifies that a chemical reaction has occurred.
Step-by-step explanation:
On reviewing the indicators of chemical change, one might observe the following changes:
Color change: Unexpected color changes might indicate a new substance has been formed.
Change in temperature: This can be indicated by a temperature increase or decrease during a reaction, signifying an energy change.
Formation of a precipitate: A solid that forms from a solution during a chemical reaction.
Bubbles of gas that form, indicating a gas has been produced in the reaction.
Therefore, all the options listed (A, B, C) are correct indicators of a chemical change. Observing one or more of these signs can suggest that a chemical reaction has taken place.