[单选题]
An object is moving with constant non-zero velocity in the +x axis.o brk1-*3gt 8fg buny3;k,lm z Thzn a-(*qjh7.,)/igf1fxoh fpbhpf:qe position versus time graph of this object ix( .:a1-fop)fnfqih g*jhfh ,b7pq/ zs
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.