Answer:
On a position-versus-time graph, along the x-axis (option b) is time usually shown.
Step-by-step explanation:
One way to describe and study the movements is by means of graphs that represent distance-time (distance as a function of time), speed-time (speed as a function of time) and acceleration-time (acceleration as a function of time).
Then, as the displacements are made while time passes, the description of the movement is facilitated by making a graph of position versus time. In the vertical axis the positions that the body occupies are usually represented and in the horizontal axis the time. Similarly, velocity or acceleration can be represented versus time, where the horizontal axis is time and the vertical axis is velocity or acceleration.
Taking into account that the horizontal axis belongs to the x axis and the vertical axis to the y axis:
On a position-versus-time graph, along the x-axis (option b) is time usually shown.