You are presented with the question "What part of a car easily changes shape from smooth to compacted by physical force?" and the following answer choices: 
- rock
 - arteries
 - fender-bender
 - an object
 - bumper
 - wreck
 - Gravity
 - sedan

Now knowing that crumple means change shape from smooth into compacted by physical force and crumple zones and bumpers are often weaker and poorer performing than in cars, choose the best answer.


 

     bumper    