An Object Starts from Rest with an Acceleration of 2

Multiple Choice

An object starts from rest 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 at the end of the 5.0 seconds interval is

A) 6.0 m/s.
B) 18. m/s.
C) 8.0 m/s.
D) 18 m/s.
E) 11 m/s.