Kiki was driving down the street in her car. She got distracted by a butterfly and did not see the car in front of her stopping. She then rear ended the car in front that was stopped at a stop sign
Collision B because Kiki's car was also impacted by an object that was moving.
Collision C because both cars were moving at the time of the accident.
Collision A because Kiki's car would be the fragile object in this situation, which was in motion and hit a motionless object.