[单选题]
A new car manufacture :,b; 26aral)4g gnd3xhiafser advertises that their car can go "from zeroe rt-pxos p4n 5h,+1qa0y0 nef to sixty in 8 s".e p q4xtn+0 1ayf5n-o,p0rhes This is a description of
A. average speed.
B. instantaneous speed.
C. average acceleration.
D. instantaneous acceleration.
