The graphs below depict different cars moving on a straight road.

To determine which graph shows a car moving with constant speed, look for a graph that has a straight line. A straight line indicates that the distance is changing at a consistent rate over time, which means the speed is constant.

- **Graph : If it is straight, then it's constant speed.
- **Graph B**: If it is also straight, then it's constant speed.
- **Graph C**: This probably indicates acceleration or deceleration (curved line).
- **Graph D**: Like Graph C, this may also show varying speeds.

Based on the description, the correct response would be any graph that is a straight line (A or B), indicating constant speed. Without seeing the graphs, I can't specify which one it is, but the constant speed graph will not have curves or varying slopes.