[单选题]
03.24:The accompanying graph describes the motion of a toy car across the b.vnk :1we7aqf) y.gpfloor y.1 )qpwbe7vk.gf:a nqi,fy9+ id;u 2 2tkb0pia0yvok/ .uzyfor 10 seconds. What is the acceleration of the tiy 0 /d2 ty.fy+z2p0iouku;qik bav9,oy car at t = 4 s?
A. $-1\;m/s^2$
B. $0\;m/s^2$
C. $1\;m/s^2$
D. $\;m/s^2$
E. $4\;m/s^2$