For the description steadily increasing displacement, constant positive velocity, the graph would be the second one. As time increases, the displacement as well increases steadily.
For steadily decreasing displacement, the first one would be the most suitable. As time increases, the displacement decreases on a steady manner.
For the third description, the graph would be close to the fourth one. Since as the time increases, the distance increases but the increase depends from point to point
For the fourth description, the correct graph is the third one. The distance is constant throughout the duration of the motion.
Lastly, the last description would match to the last graph where displacement is increasing however the velocity gradually decreases.