I’m pretty sure it’s D, Walking is low impact, requires no fancy equipment, less likely to cause injury.
Either the Conclusion paragraph, and/or Introduction Paragraph.
Assuming that you're talking about Sally ride, she was an astronaut that has took a photographic view of earth's surface from the space.
From up there , you can see the earth as a whole so it would be easier to observe every detail of its surface.
hope this helps<span />
A subtle difference in or shade of meaning, expression, or sound.