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

### Question:
Which would best aid a scientist in discovering how Earth may have changed over time?

### Choices:
A. finding the nest of a bald eagle
B. tracking the footprints of a wolf
C. analyzing the pollination of a sunflower
D. discovering a fossil of a seashell in a wooded area

### Answer:
