You are a passenger in a car, holding a cup of water in one hand. The driver is
forced to stop suddenly, causing the water in your cup to spill out in front of
you. The water likely spilled because:
A. every force is balanced by an opposing force.
B. an object in motion tends to stay in motion.
C. rapid changes in direction cause deceleration,
D. a force is exerted by a change in acceleration.