[单选题]
An object moving in b 5ty ) am.q7cs x+pkq,)ptml8the +x axis experiz p+3l x yqo6pev(osbb,-ba:/ences 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.