[单选题]
If the acceleration of an object is alway,ee, lo0tb4m kk1zs; 7bxy ol9s directed perpendicu)z4 klvm6q c 86kz2ioslar to its velocit6lc izsv)28kq k 64ozmy,
A. the object is speeding up.
B. the object is slowing down.
C. the object is turning.
D. this situation would not be physically possible.