[单选题]
An object is moving withzb:5;0zlye w whw2g, l.yx +lq1fo*bf constant non-zero velyep*rl 85n okr9q07frocity in the +x axis. The position vf05yorp9k78en q l r*rersus time graph of this object is
A. a horizontal straight line.
B. a vertical straight line.
C. a straight line making an angle with the time axis.
D. a parabolic curve.
