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

### Question:
A hillside along a highway has exposed layers of undisturbed sedimentary rock. Which method would be best for scientists to use to determine the relative age of these sedimentary rock layers?

### Choices:
A. apply the law of superposition
B. calculate the rate of radiometric decay
C. apply the law of crosscutting relationships
D. calculate the rate of tectonic plate movement

### Answer:
