The graph shows the speed of Sam’s car over time. A graph titled Speed of Car. The horizontal axis shows time (hours) and the vertical axis shows speed (m p h). Both axes are unnumbered. A line appears in 4 sections, labeled A, B, C, D. Section A shows a rise in speed over time, sections B and D maintain a level speed over time, and section C shows a reduction in speed over time. Which best describes what is happening in section C? His car is stopped. His car is speeding up. His car is slowing down. His car is traveling at a constant spee