An Object Starts from Rest and Moves with an Acceleration

Multiple Choice

An object starts from rest and moves with an acceleration of 2.0 m/s² for 3.0 seconds.It then reduces its acceleration to 1.0 m/s² for 5.0 additional seconds.The velocity 8 seconds from the start of the motion is

A) 51 m/s.
B) 38 m/s.
C) 11 m/s.
D) 9.0 m/s.
E) 7.6 m/s.