[单选题]
10.11: Consider the myvu7pmqj fotm a*9., c26 whq,otion fc+unj+cmg4 t2 om1:cof an object given by the velocity vs. time graph shown. For which time(s) is the acceleration of the object eq: fc2 +g+mmotcn1j4cuual 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