Meher had two large chunks of coal. She set fire to the first chunk and broke the second one into pieces. Help Meher understand what kind of changes happened to the two chunks of coal at the end of the activity by choosing all the applicable statements.
A. Both chunks of coal underwent physical changes only.
B. The changes were reversible for the first chunk of coal only.
C. Only physical changes took place for the second chunk of coal.
D. Both chunks of coal underwent chemical changes only. E. The first case is an example of chemical changes.