C
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
When Chemical X is added to a certain liquid, the chemical breaks into Substances Y and Z. It is not possible to break Substances Y and Z into simpler particles. Which statement is best supported by this evidence?

### Choices:
A. Chemical X is an element.
B. Chemical X is soluble in water.
C. Substances Y and Z are elements.
D. Substances Y and Z are compounds.

### Answer:
