Fact 1: Crumple means change shape from smooth into compacted by physical force.

Fact 2: Crumple zones and bumpers are often weaker and poorer performing than in cars.

Given the two facts above, answer the question "What part of a car easily changes shape from smooth to compacted by physical force?" with the following options: 
- rock
 - arteries
 - fender-bender
 - an object
 - bumper
 - wreck
 - Gravity
 - sedan


 

     bumper    