[1.5 marks]
The body starts at the reference point and reaches the same point after time t. So, the motion of the body can be represented on the displacement-time graph in the way shown above with the starting point and the ending point of the body's position being the same. Since there is no information given about the body's speed and its uniformity during the journey, it can be assumed that the body travelled with varying (non-unifom) speed which would make the graph a curve.