human
Question: As part of a study, a scientist observed a number of different molecular changes in matter. Which of the following observations provides evidence of a physical change?

Choices:
A) using heat to burn a log in a fireplace
B) using light to produce sugar in plants
C) a cake that was baked from many ingredients
D) a bottle that was broken into many small pieces
gpt
The correct answer is 3: a bottle that was broken into many small pieces.