[单选题]
A new car manufactur qx/fi4x+;v mpkg* 8jzepn6 ch yn:w8uk9+*b ipp -nf3mr advertises that their car can go "from zero to sixty in 8 s"nmb fpn:py3np 68hw -+uk9ci*. This is a description of
A. average speed.
B. instantaneous speed.
C. average acceleration.
D. instantaneous acceleration.
