[单选题]
99.15: Given the graph of the velocity mdtl 3:hcp) f;vs. time of a duck flying due south /)am yyg9s5f inb1,imfor thea,mys /5inig9)bfy m 1 winter. At what point did the duck stop its forward motion?
A. point A
B. point B
C. point C
D. point D
E. None of these