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?

  Options: 
 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: A