You are presented with the question "Why can metals expand?" and the following answer choices: 
- tectonic plates being pushed together
 - they are shiny
 - flow of electrons
 - matter vibrating
 - they have large specific heats
 - they are hard
 - they can rust
 - electron transport

Now knowing that when metal conducts heat , that metal expands and metals have large specific heats, that is why they conduct heat well, choose the best answer.


 

     they have large specific heats    