[单选题]
10.11: Consider the motion of an object given by thef zzn4gtcyvn. p 78c2; velocityerevs gm;uyi- u7o+; , vs. time graph shown. For which time(ssr u; em+oe-vg u;yi7,) is the acceleration of the object equal to 0?
A. Only at t=2.0s
B. Only at t=5.0s
C. Only at t=8.0s
D. At t=2.0s and 5.0s
E. At t=2.0s, 5.0s and 8.0s