[单选题]
An object moving in the +x axis experie.(4)xqh 4uy glf-pgytnces ajiwn t5ja:6 i afg7 l/heu0w+k07uko-n acceleration of $2.0 \; m/s^2$. This means the object is
A. traveling at 2.0 m in every second.
B. traveling at 2.0 m/s in every second.
C. changing its velocity by 2.0 m/s.
D. increasing its velocity by 2.0 m/s in every second.
