Please choose the correct answer to the 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?

Answer1: using heat to burn a log in a fireplace Answer2: using light to produce sugar in plants Answer3: a cake that was baked from many ingredients Answer4: a bottle that was broken into many small pieces

Answer format: answer1/answer2/answer3/answer4