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

Fact 2: Paper is then crumpled into the general shape and tied.

Given the two facts above, answer the question "What can change shape from smooth into compacted by physical force?" with the following options: 
- bushes
 - cracks
 - streams
 - dirt
 - crust
 - fibrils
 - rock
 - paper


 

        paper 