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

### Question:
A student is trying to identify a mineral that has a nonmetallic luster and is black. It can also be scratched with a fingernail. According to the mineral reference sheet, the unidentified mineral is most likely

### Choices:
A. mica.
B. magnetite.
C. hornblende.
D. quartz.

### Answer:
