You are presented with the question "what can flowing water slowly dissolve carbon in?" and the following answer choices: 
- zinc
 - fossil fuels
 - density
 - loose soil
 - precipitation
 - limestone
 - hydrocarbons
 - volume

Now knowing that flowing water can slowly dissolve carbon in sedimentary rock and limestone is a type of sedimentary rock, choose the best answer.


 

      limestone   