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

### Question:
When sugar is heated on a hot plate, it turns into a liquid. When the liquid sugar is cooled, a hard-crystalline substance is formed. This model best demonstrates the formation of

### Choices:
A. molten rocks.
B. igneous rocks.
C. sedimentary rocks.
D. metamorphic rocks.

### Answer:
