A distance-time graph for an object moving with uniform speed is represented by a straight line inclined to the time axis. This is because uniform speed implies that the object covers equal distances in equal intervals of time. When distance is plotted against time, this constant rate of change results in a linear relationship. Option A, a straight line parallel to the time axis, indicates that the distance is not changing with time, meaning the object is stationary. Option B, a straight line parallel to the distance axis, is not physically possible as time always progresses. Option D, a curved line, would represent non-uniform speed, where the object's speed is changing (it is either accelerating or decelerating).