The diagram shows a chemistry demonstration.
Which statement best describes this demonstration?
A.
Step one contains a compound, which is chemically combined in step two, forming a mixture in step three.
B.
Step one contains a compound, which is physically combined in step two, forming a mixture in step three.
C.
Step one contains a mixture of elements, which are physically combined in step two, forming a new compound in step three.
D.
Step one contains a mixture of elements, which are chemically combined in step two, forming a new compound in step three.