You are presented with the question "What can be used to keep warm?" and the following answer choices: 
- hair
 - eating steak
 - wool
 - fibers
 - hats
 - catching lobster
 - fueling cars
 - fur

Now knowing that insulated material can be used for keeping warm and wool and some of the new insulated fleece materials are good, choose the best answer.


 

   wool      