[单选题]
If the acceleration vector9,7 enkf;luzv j/i hb.xcm(p,rttn:vvs 0 6v/h:uqwb ; 2dj,sof an object is directed anti-parallel to the velocity v2:d rub,v:s; s 0w/tnj vt6qhvector,
A. the object is turning.
B. the object is speeding up.
C. the object is slowing down.
D. the object is moving in the negative x-direction.
