Answer: C: Texture change is not a clue that a chemical reaction is taking place.
Explanation: During a chemical reaction, the atoms in the reactants rearrange to form new products. This process can result in the formation of a solid, a change in color, or the formation of a new substance. However, the texture of the substances involved in the reaction may or may not change, and it is not a reliable indicator of a chemical reaction.
Therefore, the correct answer is C.