Among the statements provided regarding a distance vs. time graph, the following is true:
The graph should show distance on the vertical axis.
In a distance vs. time graph, the vertical axis typically represents distance, while the horizontal axis represents time. The other statements are not necessarily true: the graph can have curves (not just straight line segments), doesn't have to have a horizontal segment unless the object is at rest, and it doesn't need to start at the origin if the object was already in motion when the measurement was started.