Answer:
The correct answer is "Results".
Step-by-step explanation:
The section of "Results" in a laboratory report must describe briefly what was observed during the experiments, either by using images, tables or a combination of both. In this case, a student is reporting the effect of heat on a particular chemical seeing in the form of a color change. The student must include the color change in the "Results" section, including other valuable information such as at what temperature did the change occurred, intensity of the color, among others.