[单选题]
An object moving in ak ru) s-ak : zfl.j0zk2irrlt;w55 )otho4s rk2: .haegj f8w(oe +x axis experiences an 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.