The correct answer to this question is D, 4. This question would be found on science tests, specifically in geology courses. It deals with relative dating, which is a science that determines the order of events in the past. While it can determine the order of events, it doesn't mean it will know the true age.
Relative dating can be used to find the order of rocks, deposits, fossils, and lithologies. This process is preferred by those in the paleontology field. There are many principles of relative dating, including intrusive relationships, superposition, original horizontallity, and inclusions and components. Relative dating is also used in archaeology.