You are holding a bottle of sparkling water inside a car moving forward. When the driver applies the brakes:
a) Bubbles in the middle of the liquid will start to move forward with respect to the bottle.
b) Bubbles will start to move backward with respect the bottle.
c) Bubbles will stay at the same horizontal location in the water.
d) Depending on the speed of the car, bubbles might move forward or backward.