In efficient driving, what is recommended for decelerating?

A)Brake smoothly and go through every gear to reduce speed.
B)Brake sharply and go through every gear to reduce speed.
C)Brake smoothly and progressively without the need to go through every gear.Correct
To decelerate, it is advisable to lift your foot off the accelerator and let the vehicle roll with a gear engaged.
This way we make use of engine braking and fuel consumption will be 0.
You should brake smoothly and progressively, and if you need to downshift, do so as late as possible and without the need to go through every gear.