A position-time graph is shown below: A Position versus Time graph is shown with y-axis labeled position in centimeters up to 15 and x-axis labeled time in seconds up to 10. A straight line connects the points 0, 0 and 3, 3. A horizontal line connects points 3, 3 and 6, 3. A straight line connects 6, 3 and 10, 11.

Which statement accurately describes the speed of the object in the graph above over the 10 seconds? (2 points)

Select one:
a. Speed is decreasing.
b. Speed is constant.
c. Speed is not constant.
d. Object is at rest.