[单选题]
16.02: The position v f sbrr7y3t (bukm)*k5kt2 j.m,wa 4cws. time graph of an object moving on a horizontal line is shown. At what time(s) is the objek2twj. m4awc,ct moving with its greatest speed?
A. At time t = 3.0 s only
B. At time t= 3.5 s only
C. At times t = 3.5 s and t = 9.0 s
D. At time t = 7.0 s only
E. At time t = 9.0 s only