Answer :
B
!!!!!!!!!!!!!!!
Well if the change is reversible then it is a physical change, but if not then it is a chemical change.
Bromine (Br) is the only element listed that is a diatomic element. I believe that Bromine is going to be your answer.
If you want more instant and correct answers from people in brainly in the future please provide more information to the question you ask please and thank you. -Rogue