When you move into the deceleration lane, you should
a. accelerate to exit ramp speed.
b. slow to the exit ramp speed.
c. shift into neutral.
d. stop in the deceleration lane.

B. slow to the exit ramp speed.
To decelerate is to slow down.  
Shifting into neutral will only will make the car harder to control
Stopping the deceleration lane may lead to the person behind you crashing into your vehicle.  Highway speed limits are always greater than exit ramp speeds so you would never accelerate to exit ramp speed.