Answer :
Answer:
The correct answer is A. The original substance would have been a mixture.
Explanation:
When two or more substances (elements or compounds) come together but don't combine to make a new substance, a mixture results. The proportions of the substances in the mixture can be changed without changing the identity of the mixture.
If you had a single pure mystery substance and we obtained two other different mystery substances, that means that the original substance was a mixture of two other different mystery substances.