Antonym of ACCELERATE

Answer: Option D

Accelerate : (especially of a vehicle) begin to move more quickly.
Creep : move slowly and carefully in order to avoid being heard or noticed.
Drag : pull (someone or something) along forcefully, roughly, or with difficulty.
Lag : fail to keep up with another or others in movement or development.
Delay : make (someone or something) late or slow.

Antonym of Accelerate is Delay