Answer the following question given this paragraph: 

You can see several examples of people or things in motion in Figure below . You can probably think of many other examples. You know from experience what motion is, so it may seem like a straightforward concept. Motion can also be defined simply, as a change in position. But if you think about examples of motion in more depth, you’ll find that the idea of motion is not quite as simple and straightforward as it seems.


Q: What can be defined simply, as a change in position?

 Choices:

- velocity

- gravity

- speed

- motion

A:
motion
