You are presented with the question "where might carbon be stored for million of years?" and the following answer choices: 
- In sediment
 - stomach
 - limestone
 - refrigerator
 - weathering
 - loose dirt
 - Earth
 - body water

Now knowing that carbon may be stored in sedimentary rock for millions of years and limestone is a type of sedimentary rock, choose the best answer.


 

   limestone      