It indicates that the obect is moving, in a radial direct (towards or away from the point of reference) at a constant speed. That speed can be 0.
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The graph will be a line.
Linear = Straight line! So, a graph of a linear relationship is a straight line.
the graph is called a line
With distance on the x axis and time on the y axis a steep line would indicate a short distance traveled over a long period of time, depending on the scale of the graph.
The answer depends on what you mean by "A".